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Dynamic electromechanical control of semiconductor nanostructures by acoustic fields SAWtrain network home A Marie Skłodowska-Curie Innovative Training Network Financed by Horizon 2020 Hello! This booklet is a first step into SAWtrain, a European network aiming at the training of early stage researchers (ESR) at the PhD level. Participants, applicants, and everyone else interested in the network may become acquainted with our objective by browsing the following sections. They introduce the project, the members, the research plans of the network, and the ESR training programme, which is constructed to ensure an excellent working experience for young researchers aiming at a PhD degree. Attendants will find detailed information on the different research topics and relevant advice on how to join our network. For further information and contact, please visit our website http://www.sawtrain.eu/ home Table of Contents • Welcome to the SAWtrain Project! 1 sawtrain/inhalt • Research/ Individual research projects 23 –– About 2 –– The SAWtrain PhD programme 4 –– The Consortium 5 • Beneficiaries5 • Associated Partners 6 • The Training • • • • • • • • • • • • • • • 8 –– The Training concept 9 –– Activities10 –– Contribution of non-academic sector 11 • Research 12 –– A few words about surface acoustic waves … –– Semiconductor-based SAW- research –– Scientific work packages • Work package 1 • Work Package 2 • Work Package 3 13 14 16 17 19 21 ESR1-PDI124 ESR2-PDI225 ESR3-UVEG126 ESR4-UVEG227 ESR5-TWENTE128 ESR6-TWENTE229 ESR7-CNR30 ESR8-UAU131 ESR9-UAU232 ESR10-UPM33 ESR11-CNRS34 ESR12-UCAM135 ESR13-UCAM236 ESR14-TREL37 ESR15-CHALMERS38 • How to apply? 39 –– –– –– –– 40 40 41 How to apply? We offer We require… Application procedure deadline 21st June, 2015 –– Recruitment procedure –– and evaluation process • Attachments –– Further reading –– A short glossary –– Closing and Acknowledgements 42 43 44 45 48 51 home About2 The SAWtrain PhD programme 4 The Consortium5 Beneficiaries5 Associated Partners6 Welcome to the SAWtrain Project! home sawtrain/welcome/about/page_2 About SAWtrain is a Marie Skłodowska-Curie Innovative Training Network offering joint research training at the PhD level on the physics and applications of surface acoustic waves (SAWs) in semiconductor structures and related materials. SAWs are mechanical vibrations travelling along the surface of a material, which resemble micro earthquakes on the surface of a chip. SAWtrain aims at the investigation of SAWs in semiconductor structures as well as their exploitation for novel device functionalities. SAWtrain puts together leading groups from Europe, Asia, and North America working on SAWs including universities, research institutions, companies, and non-academic players. They will join efforts to create an interdisciplinary structured PhD programme on SAW-related phononics, photonics, and electronics. The PhD programme will rely on PhD co-supervision and secondments (internships) at different academic and non-academic hosts to cover state-of-the-art research in the interdisciplinary areas of basic physics, materials, technology, and device concepts related to SAWs. Research training will be complemented by training in transferable skills such as communication, entrepreneurship, intellectual property rights, as well as dissemination and exploitation issues. The network will encourage innovation by strengthening the bridge between basic research training and applications via the knowledge-based industrial partners of the consortium. The synergy resulting from the complementary expertise of the SAWtrain members will promote research excellence and provide students with a superior PhD programme with outstanding training opportunities. Furthermore, the interdisciplinary character of the programme and its innovation-oriented mind-set will enhance the career perspectives of the students in both the academic and non-academic sectors. → home sawtrain/welcome/about/page_3 SAWtrain has an extensive outreach and dissemination programme to increase the visibility of the research field. In particular, the partner Deutsches Museum, which is one of the world’s largest science and technology museums, will contribute its invaluable expertise to dissemination and communication to the public. The consortium will also create a discussion forum on materials, technology, human resources, and policy-making issues associated with SAWs on semiconductors and related novel materials. In conclusion, the SAWtrain research programme is designed to form entrepreneurial researchers capable of contributing effectively to the knowledge-based economy and society. In addition, the consortium aims at setting up the basis for a long-term technological platform for basic studies and applications of acoustic materials and devices, thereby establishing a new paradigm and consolidating the existing European leadership in the area. home sawtrain/welcome/phd-programme/page_4 The SAWtrain PhD programme SAWtrain will offer 15 positions for a PhD in a joint and structured programme involving 10 leading European research institutions. The program will offer you excellent research topics in an interdisciplinary environment and internships at different institutes. The research training will be complemented by a variety of workshops, schools and courses. A personal career development plan regulating the PhD training will foster your own career as a highly skilled state-of-the-art researcher with opportunities in science and industry. beneficiaries associated partners Figure 1: Geographical distribution of SAWtrain members. The countries hosting the beneficiaries and associated partners are colored in turqouise and yellow, respectively. If you are an early stage researcher (ESR) interested in our training network, we will be delighted to receive your application. See page 44 for instructions on how to apply. The Training section on page 8 briefly explains our understanding of a contemporary structured PhD programme. To find out more about surface acoustic waves and the projects’ PhD research topics, please take a look at the Research section on page 12. You are cordially invited to join us in this exciting research network! home sawtrain/welcome/consortium/page_5 The Consortium The SAWtrain consortium consists of 25 members including 10 leading European groups acting as beneficiaries (9 universities or research centres and one private-sector laboratory) and 15 partners from Europe, Asia and North America (see Figure 1), all working on surface acoustic waves (SAWs) on semiconductor and related nanostructures. Beneficiaries These are the institutions hiring the early stage researchers, where the major part of the research activities will be carried out. Among them, one finds a private-sector laboratory, six universities, and three research centres. These institutions have been responsible for several scientific and technological breakthroughs in the field of SAWs in semiconductors made since the late 1990’s, which have led to a European leadership in the area. Some of these centres are also actively involved in the development of advanced materials and technologies for SAW devices (such as TWENTE, PDI, UPM, and CHALMERS) as well as with their integration with Si-CMOS technology (TWENTE). Altogether, the beneficiaries will host 15 individual research projects for ESRs. They will be in charge of the academic and the interdisciplinary training, supported by the associated partners. → home sawtrain/welcome/consortium/page_6 CHALMERS Chalmers Tekniska Hoegskola, Göteborg, Sweden CNR Institute of Acoustic and Sensors Corbino – Consiglio Nazionale delle Ricerche, Roma, Italy CNRS Institut Neel – Centre National de la Recherche Scientifique, Grenoble, France PDI Paul-Drude-Institut für Festkörperelektronik – Forschungsverbund Berlin, Berlin, Germany TREL Toshiba Research Europe Ltd., Cambridge, United Kingdom TWENTE Universiteit Twente, Enschede, The Nederlands UAU Universität Augsburg, Augsburg, Germany UCAM University of Cambridge, Cambridge, United Kingdom UPM Universidad Politécnica de Madrid, Madrid, Spain UVEG Universitat de València, Valencia, Spain You will find more information on the beneficiaries in the individual research project section. Associated Partners SAWtrain includes as associated partners five universities, two large companies and six small and medium-sized enterprises (SMEs). EPCOS, a worldwide leading company on acoustic devices for signal processing, and NTT-BRL (as well as the beneficiary TREL) are key players in SAW-based applications for quantum information processing. NTD, Mach8Lasers and SolMateS are SMEs in the fields of SAW materials and technologies, which will be strongly involved in research activities. VLC Photonics brings expertise in integrated photonics while PicoQuant and Protemics will provide know-how on optical and THz spectroscopy. The associated partner HU Graduate School will provide training in soft skills. The Deutsches Museum, one of the world’s largest science and technology museums, will contribute invaluable expertise in dissemination and communication to the public. → home sawtrain/welcome/consortium/page_7 Large-scale enterprises: • EPCOS AG, Germany Academic: • NTT-BRL Nippon Telephone & Telegraph Corporation – Basic Research Labs, Japan • AALTO University, Finland Small and medium enterprises (SMEs): • ICMM Instituto de Ciencia de Materiales de Madrid – Consejo Superior de Investigaciones Científicas (CSIC), Spain • MACH8LASERS Mach8lasers B. V., The Netherlands • QUEENS Queen’s University, Canada • NT&D, Germany • LEEDS University of Leeds, United Kingdom • PICOQUANT PicoQuant GmbH, Germany • PROTEMICS Protemics GmbH, Germany • SOLMATES SolMateS B. V., The Nederlands • VLCPHOTONICS VLC Photonics S. L., Spain • UCM Universidad Complutense de Madrid, Spain Education/outreach: • Deutsches Museum, Germany • Humboldt Humboldt Graduate School, Germany home The Training concept 9 Training activities 10 Contribution of non-academic sector 11 The Training home sawtrain/training/concept/page_9 The Training concept SAWtrain brings together leading groups from Europe, Asia, and North America, working on surface acoustic waves (SAWs) on semiconductor and related nanostructures. Together, a new challenging and stimulating network for training PhD students will be created. The synergy resulting from combined expertise will promote research excellence and provide early stage researchers (ESRs) with training opportunities far superior to those offered in normal PhD programmes thus equipping them with the right combination of research-related and transferable competences. Through international, interdisciplinary, and intersectoral mobility in combination with an innovation-oriented mind-set, the students will be given enhanced career perspectives in both the academic and non-academic sectors. The research training will be implemented by partnerships of universities, research institutions and infrastructures, non-academic actors, and SMEs, from different countries across Europe and beyond. The research activities will be carried out with secondments (internships) at different academic and non-academic hosts to cover state-ofthe-art research in the interdisciplinary areas of basic physics, materials, technology, and device concepts related to SAWs. The coordinated training will also contain topical courses, schools, conferences, and workshops and be complemented by measures to develop key competences and skills, fostering the future career plan of the young researchers. In particular, strong emphasis will be put on transferable skills such as entrepreneurship, management and financing of research activities and programmes, management of intellectual property rights, other methods of exploiting research results, ethical aspects, communication, standardisation and societal outreach. The ERSs will follow a structured PhD programme established on an individual basis by a personal career development plan (PCDP). The PCDP will define the ESR supervision arrangement (including mandatory co-supervision from advisors from different institutions as well as non-academic mentorship), the research programme (and the associated secondments), as well as the extra training measures to develop the ESR key competences and skills. The training process will be continuously monitored and evaluated. home sawtrain/welcome/activities/page_10 Training activities The ESR will participate in a wide range of training activities such as: • Regular network meetings with evaluation of the ESR research projects • Secondments: these are internships for the ESRs on a partner site. Each ESR will take part in at least one academic and one non-academic secondment • Training events –– Schools and workshops: SAWtrain will organize a two-week Summer School as well as a final scientific symposium –– Topical Training Workshops (TTWs) to be offered during network meetings, schools and symposia. The following TTWs are scheduled: • TTW1 | SAW physics • TTW2 | Intellectual property and spin-off • TTW3 | SAW technology • Interdisciplinary hands-on training, consisting of 1-2 week courses on specific topics offered by a SAWtrain partner • Extension and soft skills courses, to be offered at beneficiaries’ or associated partners’ sites (e.g. the partner HU Graduate School) • ESR retreats: self-motivated training activities organized by the ESRs. These events will be organized by the ESR representation board according to the needs and suggestions of the ESRs • Active involvement of ESRs in the dissemination and exploitation activities, including intellectual property rights (IPR) activities and dissemination via the partner Deutsches Museum home sawtrain/welcome/non-academic/page_11 Contribution of non-academic sector The network will encourage innovation by strengthening the bridge between basic research training and applications. The consortium includes as beneficiary one big private-sector laboratory (TREL) as well as two large companies (EPCOS and NTT-BRL), and six small and medium-sized enterprises (SMEs) (NTD, Mach8Lasers, SolMateS, VLC Photonics, Pico Quant, and Protemics) as associated partners. All these knowledge-based companies will be directly involved via secondments (i.e. PhD student internships in these institutions to acquire relevant skills): they will also actively contribute to and profit from the network training, dissemination and exploitation measures. EPCOS is a world-leading company on acoustic devices for signal processing while TREL and NTT-BRL are key players in SAW-based applications for quantum in- formation processing. NTD, Mach8Lasers and SolMateS are SMEs in the fields of SAW materials and technologies, which will be strongly involved in research activities. VLC Photonics brings expertise in integrated photonics while PicoQuant and Protemics will provide know-how on optical and THz spectroscopy. Internships in these companies will allow young researchers to gain experience with activities in the industrial environment. While bringing additional value to the training of PhD students, the synergy between partners from academia and private sectors will contribute to the promotion of industrial applications of SAW-based semiconductor structures. Additionally, associated partner Deutsches Museum will contribute invaluable expertise in dissemination and communication to the public. home A few words about SAWs Semiconductor-based SAW research Scientific work packages Work package 1 Work Package 2 Work Package 3 13 14 16 17 19 21 Research home sawtrain/research/a-few-words-about/page_13 A few words about surface acoustic waves … SAWs are elastic vibrations traveling along a surface. They are analogous to the waves generated by earthquakes that travel around the surface of the earth (Rayleigh waves), but with much smaller wavelengths (typically in the micro- and sub-micrometre range, in contrast with the wavelength of several metres for seismic waves). SAWs can be generated electrically in a piezoelectric medium using interdigital transducers (IDTs). As illustrated in Figure 2, the IDTs consist of two interlocking arrays of metal electrodes deposited on the surface of the material, which is normally fabricated using planar semiconductor technology. The application of a radio-frequency (RF) voltage to the IDT launches a strain field, which propagates in the form of a strain wave along the surface to the region outside the transducer. In a piezoelectric material, the strain wave is accompanied by a piezoelectric field, i.E. a wave of electrostatic potential. SAWs on piezoelectric insulators have been used for numerous applications, most notably in signal processing, sensors, and acousto-optics, where they have a well-established place. The hundreds of millions of SAW devices incorporated in mobile phones worldwide attest to the economical and societal impact of SAW technology. RF IDT SAW quantum well Present-day electronic devices normally rely on electric fields to control the properties of semiconductor crystals. Semiconductors are also very sensitive to other parameters, e.g. strain, temperature and magnetic fields: their exploitation towards novel functionalities forms the basis of the “More than Moore” pathway in the development of integrated devices. SAWtrain aims at exploring novel functionalities provided by SAWs in semiconductor nanostructures and related materials, where the dynamic strain and piezo-electric fields produced by the SAW modulate the material properties and create moving potentials for the confinement and transport of carriers. SAWtrain will mainly focus on the exploitation of these fields for the control of excitations (carriers, spins, photons, and phonons) in semiconductor and related structures. Figure 2: Surface acoustic wave (SAW) generated by an interdigital transducer (IDT) on a semiconductor crystal containing quantum well structure. home sawtrain/research/semiconductor-based/page_14 Semiconductorbased SAWresearch SAWtrain will focus on the exploitation of the moving SAW fields as tool for the control of carriers, spins, phonons, and photons in semiconductor and related structures. In addition, the research activities will develop materials and technological tools for the generation and control of high frequency SAWs, which will also support the conventional application areas of SAWs. The SAWtrain members have contributed to many scientific and technological breakthroughs in the field of SAWs since the late 1990’s. The original work on acoustic transport of single electrons was carried out at UCAM, thus demonstrating the possibility of SAW-modulated quantum control. Further developments by this group and CNRS led to the demonstration of SAW-induced transfer of single carriers between quantum dots. The seminal works on SAW-induced light storage as well as on long-range transport of carriers and spins were carried out at UAU and PDI. Examples of advanced applications in electro-optical control are provided by single-photon sources, tuneable photonic crystals and integrated photonic devices developed recently by PDI, TREL, UCAM, UAU, and UVEG. Recent experiments by CHALMERS demonstrated detection of pulses containing single SAW quanta. SAWtrain members have also been very active in the development of technologies to generate SAWs with very high frequencies, some of the highest values being reported by TWENTE, NTD and PDI. Novel approaches for the application of SAWs to new materials (e.g. graphene, UPM and PDI), advanced sensors (CNR), as well as for the control of chemical reactions (UAU) have been introduced by the consortium beneficiaries. Finally, SAW-based sensors are key elements in the road map for semiconductor technologies, due to their simplicity, high sensitivity, and good time response. These developments have opened the way for novel SAW-based concepts and functionalities for signal processors, sensors, optical modulators and switches, nano-mechanical structures, and quantum control of single electrons, photons, and phonons, which are key enabling technologies to be investigated within SAWtrain. → home sawtrain/research/member-chart/page_15 Figure 3: Interactions between the partners and research areas. Phononics PDI CNR EPCOS Twente Chalmers SolMateS Queens NTD Electronics CNRS UCAM AALTO Leeds UPM UAU UVEG UCM CSIC Protemics NTT-BRL Photonics TREL Humboldt Deutsches Museum (outreach) PicoQuant VLC Photonics MACH8 Lasers beneficiaries associated partners university research institute non-academic sawtrain/research/workpackages/page_16 Scientific work packages Research SAWtrain will focus on three main research areas related to SAW-driven phononics, photonics, and electronics. The contribution from the SAWtrain members to each one of these areas is illustrated schematically in Figure 3. The research activities within the areas are organized in the following three scientific work packages. → home sawtrain/research/workpackage-1/page_17 Work package 1: SAW-Tech: SAW Materials & Technology (Coordination: TWENTE) This work package will cover research on phononics and focus on materials and processing technologies for the generation of high-frequency SAWs on novel materials and structures (e.g. graphene, oxides, membranes, and SAW-based phononic crystals) as well as their integration with silicon CMOS technology. One of the goals is the development of very high-frequency SAW structures integrated with electronic devices for signal processing and sensing, as well as for the manipulation of photons, carriers, and spins in Si, graphene, and complex oxides. In particular, we will explore nano-imprint lithography for SAW frequencies above 20 GHz. We will also investigate novel concepts for SAW-based sensing elements as well as for the acoustic control of chemical reactions. This research area will also provide the technological basis for some of the advanced applications addressed in the fields of photonics and electronics. ESR research projects: This WP will offer the six ESR projects listed in Figure 4, which also summarises the planned secondments. The ESRs in this WP will design and fabricate high-frequency SAW devices using nano-imprint lithography and other advanced cleanroom techniques. The SAW devices will be used to realise acousto-electronic transport in Si-based structures (ESR5-TWENTE1), acousto-mechanical tuneable graphene (ESR1-PDI1), acousto-electronic transport in complex-oxide multilayers (ESR6-TWENTE2), integrated sensors based on Lamb waves (ESR7-CNR), acousto-photocatalysis (ESR8-UAU1) and high-Q 1D and 2D phononic cavities (ESR3-UVEG1). home sawtrain/research/workpackage-1/page_18 WP1-1 TWENTE WP1-2 PDI WP1-3 TWENTE WP1-4 CNR WP1-5 UAU WP1-6 UVEG Ultrahigh-frequency silicon acousto-electronics Acousto-mechanical tuneable few-layer epitaxial graphene Ultrahigh-frequency complex-oxide acousto-electronics Integrated sensors based on Lamb waves Acoustophotocatalysis High-Q one- and two- dimensional phononic cavities ESR1-PDI1 ESR6-TWENTE2 ESR7-CNR ESR8-UAU1 ESR3-UVEG1 ESR5-TWENTE1 co-supervision PDI co-supervision Twente co-supervision SolMateS co-supervision UPM co-supervision CNR co-supervision Chalmers Academic and non-academic secondments Chalmers NTD PDI UAU CNR Twente SolMateS Twente UPM SolMateS UAU SolMateS PDI UAU EPCOS CNR NTD NTD/Twente UPM Chalmers Queens Leeds SolMateS UPM CNRS Chalmers PDI NTD Figure 4: Partners and secondments for WP1 (Down- and up arrows mean partner involved in out- and in-going secondments, respectively, associated with this research activity.) home sawtrain/research/workpackage-2/page_19 Work Package 2: SAW-PhoXon: SAW-driven hybrid nanophotonic and nanophononic structures (Coordination: UAU) The combination of photonics and phononics, termed PhoXonics, will lead to the exploitation of acoustic and optic resonators for the control of SAW and light quanta down to the single-particle level, which are expected to provide functionalities such as SAW-driven single-photon and single-phonon sources and detectors. Bulk acoustic fields are routinely used in optical devices, most prominently the acousto-optic modulator (AOM). To meet the requirements for future applications in advanced quantum optoelectronic devices, both the driving acoustic fields and the optical systems have to be adapted and improved. We combine in WP2 activities to (i) confine and enhance acoustic fields in phononic resonators and to (ii) explore the interaction of these localised acoustic fields with photonic semiconducting or superconducting quantum two-level systems. This emerging class of phoXonic devices harness and transduce energy stored in electromagnetic fields and heat. These novel de- vice concepts are envisioned to become a key enabling technology (KET) for future self-powered consumer products succeeding Photonics, which is a KET within Horizon 2020. ESR research projects in WP2: This WP consists of the four ESR projects summarised in Figure 5. The ESRs in this work package will design and fabricate high-quality phononic cavity devices and use advanced cleanroom nanofabrication to deliberately couple the resonating acoustic fields to emerging electrically and optically active structures. The latter includes high-quality solid-state quantum emitters, self-assembled quantum dots (QDs) (ESR9-UAU2), superconducting qubits (ESR15-CHALMERS), QDs in optical microcavities (ESR14-TREL), and integrated photonic devices (ESR4UVEG2). → home sawtrain/research/workpackage-2/page_20 WP2-1 TREL WP2-2 UAU2 WP2-3 UVEG2 WP2-4 Chalmers Acoustic tuning of light-matter interaction for regulated single photon generation Acousto-mechanical coupling of quantum emitters and high-Q acoustic resonators Advanced waveguide acoustic modulators for integrated photonic networks Electrical spectroscopy of propagating acoustic fields at the single phonon level ESR14-TREL ESR9-UAU2 ESR4-UVEG2 ESR15-Chalmers co-supervision UCAM co-supervision UVEG co-supervision UAU co-supervision PDI Academic and non-academic secondments NTD/Twente UCAM PDI UVEG Pico Quant PDI VLC Mach8 UAU TREL NTD UVEG CNR UAU UCAM Figure 5: Partners and secondments for WP2 (Down- and up-arrows mean partner involved in out- and in-going secondments, respectively, associated with this research activity.) home sawtrain/research/workpackage-3/page_21 Work Package 3: SAW-Transport: SAW-based quantum transport (Coordinated by UCAM) This research area is devoted to electronic functionalities related to the transport and manipulation of carriers and spins by moving SAW fields, with emphasis on carrier and spin control at the single-particle level for application in quantum information processing. Experimental work will be supported by theory. Single-electron control in solids is a driving force behind research in quantum physics with applications in quantum computing. Major challenges are the transport of a single electron from one functional part of a circuit to another in a very controlled way. Recent experiments at both CNRS and UCAM2 have transported a single electron from one QD to another using a SAW. One can similarly exploit the spin degree of freedom of a single electron. For that purpose, one requires narrow SAW transport channels as well as mechanisms for efficient generation and readout, e.g. using single-photon sources (SPSs). Likely advantages of these SPSs are the small jitter in the photon emission time and GHz repetition rates. Their fabrication is also compatible with conventional semiconductor technology. This WP aims to implement such novel ideas to realise single-electron electronics and to use SAWs to process or transform quantum information carried by electrons and/or photons. It focuses on SAW-driven transport of single electrons, the control of their spins, and the readout of the spin by conversion to polarised single photons using high-repetition-rate SPSs. In addition, interaction of a moving SAW potential with graphene will be studied to develop plasmon launchers and electron pumps. ESR research projects in WP3: The five projects are summarised in Figure 6. They provide ESRs with exciting training in SAW-related quantum-information phenomena including: integration of different functionalities for advanced SPSs based on single-carrier transport using quantum wires in microcavities (ESR2-PDI2), coupling electron and hole regions (ESR12UCAM1), spin-qubit coupling mediated by dynamic QDs (ESR11-CNRS), and exploitation of new materials (e.g. graphene) for manipulation of single carriers and photons (ESR10-UPM). Experimentalists will interact with theorists modelling their devices (ESR13-UCAM2). → home sawtrain/research/workpackage-3/page_22 WP3-1 PDI WP3-2 UCAM WP3-3 CNRS WP3-4 UCAM WP3-5 UPM Gigahertz single-photon sources based on coupled quantum wires and dots in microcavities SAW-driven source of polarised single photons Single-electron electronics and quantum optics with flying electrons Theory of electron transport and electron-to-photon qubit conversion SAW-modulated graphene for plasmonics and electronics ESR2-PDI1 ESR12-UCAM1 ESR11-CNRS ESR13-UCAM2 ESR10-UPM co-supervision UCAM co-supervision CNRS co-supervision AALTO co-supervision UCAM co-supervision PDI Academic and non-academic secondments UCAM CNR Protemics PDI CSIC-UCM Twente AALTO PDI PDI UCAM NTT Twente UPM PDI CNRS Chalmers TREL CNRS NTT-BRL UCAM PicoQuant UVEG Twente Figure 6: Partners and secondments for WP3 (Down- and up-arrows mean partner involved in out- and in-going secondments, respectively, associated with this research activity.) home ESR1-PDI1 ESR2-PDI2 ESR3-UVEG1 ESR4-UVEG2 ESR5-TWENTE1 ESR6-TWENTE2 ESR7-CNR ESR8-UAU1 ESR9-UAU2 ESR10-UPM ESR11-CNRS ESR12-UCAM1 ESR13-UCAM2 ESR14-TREL ESR15-CHALMERS (WP1-2)24 (WP1-2)25 (WP1-6)26 (WP2-3)27 (WP1-1)28 (WP1-3)29 (WP1-4)30 (WP1-5)31 (WP2-2)32 (WP3-5)33 (WP3-3)34 (WP3-2)35 (WP3-4)36 (WP2-1)37 (WP2-4)38 Research/ Individual research projects home ESR1-PDI1 Acousto-electric modulation of few-layer epitaxial graphene (WP1-2) sawtrain/ind-research/esr1-pdi1/page_24 RF IDT¹ z EG Host: Paul-Drude Institut für Festkörperelektronik (PDI) Supervision: P. V. Santos (PDI), Co-supervisor: W. van der Wiel (TWENTE) Objectives: This Project aims to exploit super high-frequency (SHF, >3 GHz) SAWs for carrier transport1 and band-structure modulation2 of epitaxial graphene (epiG) on SiC. The ESR will synthesise epiG and study transport properties under SAW with wavelengths comparable to the carrier mean free path (≤100 nm) aiming at mobility control3 and possible detection of phonon-mediated superconductivity. Strong SAW fields will be obtained by coupling epiG to phononic crystals. The activities will include (i) epiG synthesis by surface graphitization of SiC, (ii) fabrication of SHF IDTs by nanoimprint lithography (secondment at NTD/TWENTE) and e-beam lithography (secondment at CHALMERS), (iii) Raman and magneto-transport spectroscopy studies (secondment at LEEDS) under short-period SAWs (see also WP3-5), (iv) fabrication and characterisation of phononic crystals on epiG (secondment at QUEENS). Theoretical support and training will be provided by CSIC/UCM. Expected Results: Demonstration of carrier control and transport in epiG by SHF SAWs, aiming at acoustic switches and attenuators and analogues to optical devices (e.g. electron super-collimators and lenses). The multidisciplinary ZnO SAW SAW IDT² x I SiC RF training will include: synthesis of epiG on SiC, characterization techniques (Raman spectroscopy, AFM, Hall measurements), cleanroom techniques (photolithography, nanoimprint lithography, e-beam lithography, etching, sputtering of piezoelectric layers), measurement techniques for SAW devices (interferometry, magnetotransport, spectroscopy), design of phononic-crystals and characterization, as well as theoretical training. Candidate Profile: MSc or a diploma in physics, materials science, or electrical engineering. A background in experimental solid-state physics, semiconductor/graphene growth and processing, acoustics and optical spectroscopy will be considered a plus. For further details about the project, please contact [email protected] Figure 7: Acoustic transport on epitaxial graphene on SiC1 _ 1P. V. Santos et al., Appl. Phys. Lett. 102, 221907 (2013) 2Vozmediano et al., Phys. Rep. 496, 109 (2010) 3C.-H. Park et al, Nano Lett. 8, 2920 (2008); Phys. Rev. Lett. 101, 126804 (2008) home ESR2-PDI2 Gigahertz single-photon sources using coupled quantum wells and dots in microcavities (WP1-2) sawtrain/ind-research/esr2-pdi2/page_25 photons laser RF Host: Paul-Drude Institut für Festkörperelektronik (PDI) Supervision: P. V. Santos (PDI), Co-supervisor: A. Shields (TREL) Objectives: QDs IDT h h e We aim at the investigation of acoustically driven GHz single-photon sources (SPSs4) based on acoustic transport in interconnected (Al,Ga)As quantum wells (QWs) and dots (QDs5). These SPSs operate at GHz frequencies and are expected to have very high photon yield and anti-bunching ratios. The QWs and QDs will be embedded into optical microcavities (MCs) produced by molecular beam epitaxy (MBE) on e-beam patterned GaAs substrates6. Single-carrier control will be achieved by including gate electrodes along the transport channel (collaboration with UCAM and CNRS). Acoustic carrier and spin transport (with NTT-BRL) as well as single-photon detection and emission will be investigated. Electrically driven SPSs may be achieved by adding doped contacts (as in WP3-2) to inject carriers. Finally, ESR2-PDI2 will carry out carrier and spin transport as well as photon correlation using spatially and time-resolved photo-luminescence (with PICOQUANT,NTT-BRL). Expected Results: Candidate Profile: Highly efficient SPSs with repetition rates above 1 GHz. ESR2-PDI2 will be involved in MBE growth of coupled QWRs/QDs in MCs on pre-patterned GaAs substrates, being exposed to different structural (XRD, SEM, TEM) and morphological (AFM, optical microscopy) techniques. The ESR will learn advanced fabrication techniques (optical and e-beam lithography, at UCAM) as well as tools to calculate and measure acoustic and optical properties. MSc or a diploma in physics, materials science, or electrical engineering. A background in experimental solid-state physics, semiconductor growth and processing, acoustics and optical spectroscopy will be considered a plus. e SAW quantum well For further details about the project, please contact [email protected] Figure 8: Acoustically driven single-photon source with emission centres embedded in an optical microcavity.5 _ 4 Lounis, B. & Orrit, M. Single-photon sources. Rep. Prog. Phys. 68, 1129–1179 (2005). O. D. D. Couto, Jr. et al., Nat. Phot. 3, 645 (2009); S. Lazic, R. Hey, and P. Santos, New J. of Phys. 14, 013005 (2012). 5 6 F. Alsina et al., Phys. Rev. B 67, 161305R (2003). ESR3-UVEG1 High-Q one- and two-dimensional phononic cavities (WP1-6) Host: University of Valencia (UVEG) Supervision: M. de Lima, Co-supervisor: P. Delsing (Chalmers) sawtrain/ind-research/esr3-uveg1/page_26 Bragg reflectors (BRs) δ=0.27 Contact Pad 109.2µm IDT₂ IDT₁ Objectives: We have recently demonstrated analogues of fundamental quantum-mechanical systems (Bloch oscillations, Wannier-Stark ladders and Landau-Zener tunnelling) based on SAWs propagating in 1D coupled acoustic cavities7. The coupling between these cavities can be electrically tuned by controlling the potential of the acoustic cavities’ electrodes8. The objectives of the ESR3-UVEG1 are the extension of this seminal work to 2D tuneable phononic cavities as well as obtaining cavities with high Q-factor for different applications. In this way, this work will collaborate with ESR9-UAU2 that aims at using phononic cavities to couple phonons with excitons. Another application is their combination with the ridge waveguide photonic devices investigated by ESR4-UVEG2. Finally, these phononic cavities will also be used to detect acoustic fields down to the single-phonon limit in a strong collaboration with ESR15-CHALMERS. Cavity lengths Ln=L₀/(1+nδ) 5 Coupled Cavities L₀ 3λ /2 19.5 bi-layers NiCr/Au LiNbO₃ their nanoimprint capabilities. In addition, in this secondment ESR3-UVEG1 will have contact with an industrial environment. Acoustic-field mapping will be obtained by interferometry, in collaboration with PDI. In a secondment to CHALMERS the student will apply the cavities to detection at the single-phonon level and will acquire knowledge on measurements at very low temperatures. Expected Results: ESR3-UVEG1 will learn how to calculate, design and fabricate SAW cavities for different applications. This work will lead to 2D coupled phononic cavities as well as high-Q structures, in collaboration with UAU. The ESR will learn to fabricate structures with small dimensions and high frequencies, in collaboration with NTD taking advantage of Candidate Profile: Candidates with experience on acousto-optics, surface acoustic waves, solid-state physics, and cleanroom operation will be favoured. For further details about the project, please contact [email protected] Figure 9: One-dimensional coupled surface acoustic cavities _ M. M. de Lima et al. Phys. Rev. Lett. 104, 165502 (2010). 7 8 M. M. de Lima et al. Appl. Phys. Lett. 100, 261904 (2012). home ESR4-UVEG2 sawtrain/ind-research/esr4-uveg2/page_27 Waveguide acousto-optical modulators for integrated photonics (WP2-3) Host: University of Valencia (UVEG) Supervision: M. de Lima, Co-supervisor: H. Krenner (UAU) Objectives: ESR4-UVEG2 will explore applications of SAWs as WG modulators and switches for integrated photonics. We have recently demonstrated the feasibility of SAW-controlled structures with the realisation of compact and monolithic modulators based on conventional ridge WGs on GaAs9. This modulator consists of a multiple-channel Mach-Zehnder interferometer (MZI) driven by a single SAW. Subsequent developments have led to two patents10. In collaboration with VLC Photonics, ESR4-UVEG2 will investigate novel photonic functionalities based on SAW-modulation of ridge WGs. Initially, structures will be fabricated by ESR4-UVEG2 on (Al,Ga)As followed by application-relevant platforms for integrated photonics. The ESR will study InP with SME MACH8LASER and will combine optical WGs with grating-based phononic cavities (ESR3-UVEG1, ESR9-UAU2). Expected Results: through a secondment there. In addition, the ESR will investigate the incorporation of photonic devices within the acoustic gratings (collaboration with ESR3-UVEG1) that locally enhance the acoustic fields. At the start the ESR will search for the realisation of modulators operating on the (Al,Ga)As platform for operation at 1.55 µm. Finally, the ESR will proceed to InP, which can be combined with integrated light sources (MACH8LASER). Figure 10: SAW-driven phased-array wavelength division demultiplexing device. _ M. M. de Lima et al. App. Phys. Lett. 89, 121104 (2006). 9 Beck et al. European Patent 1990677B1 and Capmany et al. WO2012152977A1. 10 ESR4-UVEG2 will be trained on the design, simulation, fabrication, and demonstration of novel photonic functionalities based on the SAW modulation of ridge waveguides on different material systems. The simulation of the photonic devices will be performed in a direct collaboration with VLC Photonics. Training on time-resolved measurements using PicoQuant equipment will be achieved Candidate Profile: Candidates with experience on acousto-optics, integrated photonics, surface acoustic waves, solid state physics, and cleanroom operation will be favoured. For further details about the project, please contact [email protected] home ESR5-TWENTE1 sawtrain/ind-research/esr5-twente1/page_28 Ultrahigh-frequency silicon acousto-electronics (WP1-1) Host: University of Twente (TWENTE) Supervision: W.G. van der Wiel (TWENTE), Co-supervisor: P. V. Santos (PDI) Objectives: Generation of ultrahigh-frequency (UHF) SAWs on Si multilayers with mesoscopic structures such as quantum point contacts (QPCs), acoustic switches (AS) and NIP (n-type/intrinsic/p-type) regions for acoustic charge pumping, switching and photon generation/detection. TWENTE (with NTD and SolMateS) has demonstrated a CMOS-compatible nano-imprint lithography (NIL) process for UHF IDTs with record frequencies (up to 24 GHz). The acoustic current through QPCs pumped at these frequencies should reach 1-20 nA even in the single-electron/SAW-cycle regime, thus providing a very precise current-standard measurement for metrological applications. Electrically induced electrons can be picked up by a SAW and transported to a p-doped region leading to electron-hole recombination. Photon generation can be enhanced by quantum confinement in the silicon, which is known to enable a direct band gap. There are strong links with WP1-2 and WP1-3. Expected Results: The PhD student will develop and fabricate NIL IDTs (with NTD) for UHF SAWs on different substrates, but focus on Si-based multilayer systems. The PhD student will use si- mulation tools to design, optimise, produce masks, and fabricate IDTs, thereby learning several cleanroom processes. IDTs will be combined with on-chip electronic or optical micro/nano devices. Acousto-(opto) electronic measurements will be partially carried out at PDI. Pulsed laser deposition (PLD) of piezoelectric films will be learned during an internship at SolMateS. Knowledge about integration of NIL-fabricated IDTs with graphene devices will be learned from the collaboration with UPM and PDI, and integration with Lamb-wave sensors from the collaboration with CNR. Many other WPs will try out NIL developed in this WP as it will make the lithography of small-period transducers much easier. Candidate Profile: Candidates with experience in solid-state physics, nanoelectronics, surface acoustic waves, and particularly cleanroom skills will be favored. For further details about the project, please contact [email protected] home ESR6-TWENTE2 sawtrain/ind-research/esr6-twente2/page_29 Ultrahigh-frequency complex-oxide acousto-electronics (WP1-3) Host: University of Twente (TWENTE) Supervision: W.G. van der Wiel, Co-supervisor: Arjen Janssens, M.Sc. (SolMateS) Objectives: Generation of ultrahigh-frequency (UHF) SAWs on complex-oxide multilayers, in particular on top of the SrTiO3/ LaAlO3 conducting interface11. Complex oxides display a very strong interplay between the electronic, orbital and structural degrees of freedom, leading to rich magnetic effect12 and superconductivity13, which are not found in their semiconducting counterparts (e.g. like GaAs/AlGaAs). The conducting interface is close to the surface, which can be epitaxially coated by strong piezoelectrics (e.g. LiNbO3), thus making this materials system very suitable for carrier manipulation by SAWs. Hardly any work has been done in this field. Acoustic transport will be investigated in structures similar to those on GaAs and Si. Our aim is to integrate the SAW technology with the oxide electronics and to demonstrate carrier and spin transport. We will hereby hugely benefit from the world-class oxide growth facilities and expertise in TWENTE. port will be studied in complex-oxide heterostructures, also in combination with nanoelectronic devices defined in the conducting interface. We expect to realise a SAW sensor based on a complex-oxide system with a monolayer with organic receptor molecules on top. Candidate Profile: Expected Results: ESR6-TWENTE2 will fabricate UHF SAW devices on SrTiO3/LaAlO3 conducting interfaces, using NIL. Design of the devices will be in collaboration with PDI. Suitable piezoelectric layers will be grown epitaxially on top using PLD in collaboration with SolMateS. Acousto-electronic trans- Candidates with experience in solid-state physics, nanoelectronics, surface acoustic waves, complex oxides, and particularly cleanroom skills will be favored. For further details about the project, please contact [email protected] 11 A .Ohtomo and H.Y. Hwang, Nature 427, 423 (2004). 12 A. Brinkman et al., Nature Materials 6, 493 (2007). 13 N. Reyren et al., Science 317, 1196 (2007). home ESR7-CNR sawtrain/ind-research/esr7-cnr/page_30 Integrated sensors based on Lamb waves (WP1-4) Host: Institute of Acoustic and Sensors Corbino (CNR) Supervision: C. Caliendo, Co-supervisor: J. Pedrós (UPM) Objectives: We will investigate new viable modes (leaky longitudinal SAW, LLSAW, twice as fast as a SAW, shear horizontal (SH) SAW and quasi-longitudinal plate modes, QLMs) propagating on new piezoelectric materials (such as GaPO4, the LGS-family, etc.) for application in liquids sensing (determination of density, viscosity, conductivity, permittivity, and detection of small mass changes). Such acoustic modes have not been exploited deeply yet for sensing applications, thus their study introduces a new element in the landscape of the AW sensor field. Lamb-wave resonators and sensors will be designed and fabricated, based on composite plates comprising a piezoelectric film (GaN, ZnO or AlN) grown on a non-piezoelectric layer (such as SiN, SiO2 or a-SiC) for high-frequency, enhanced-coupling, temperature-compensated devices. The growth of c-axis-inclined AlN films will be optimised for SH wave excitation. Fabrication and characterization of CMOS-integrated Lamb-mode micro-devices (localised back-side etching of Lamb-devices based on AlN/SiO2). Expected Results: (I) Theoretical study of phase and group velocity, electroacoustic coupling coefficient, temperature coefficient of delay of LLSAW, SHSAW and quasi-longitudinal Lamb modes (UPM); (II) Design of sensors for liquids; (III) test of the sensor performance (sensitivity, resolution, detection limit, calibration curve, etc.) in comparison with commercial sensors; (iv) high-resolution lithography, silicon micromachining, wafer thinning, and device characterisation techniques (TWENTE, UAU); (v) graphene deposition (UPM) on to the device surface to test the gas-sensing properties of graphene for environmental monitoring. Figure 12: Piezoelectric excitation of Lamb waves on membranes. Candidate Profile: MSc or a diploma in physics, or electrical engineering, with experience in SAW and theoretical modelling; background in experimental cleanroom processing will be considered a plus. For further details about the project, please contact [email protected] home ESR8-UAU1 sawtrain/ind-research/esr8-uau1/page_31 Acoustophotocatalysis (WP1-5) Host: Universität Augsburg (UAU) Supervision: A. Wixforth and C. Westerhausen, Co-supervisor: C. Caliendo (CNR) cation at TWENTE). Acoustic resonators and phononic crystals will be employed to optimise the coupling to the catalyst and SAW intensities (UVEG, UAU2). Objectives: This project, part of the overall strategy of the Wixforth group (UAU), aims towards understanding and realising acoustically assisted (photo) catalysis, employing SAWs on semiconductor hybrid chips. Hence, it combines experience in semiconductors and soft-matter physics over two decades14. The application of ultrasonic SAWs in heterogeneous catalysis was pioneered by Inoue et al.15, who showed that a SAW significantly lowers the activation energy for several catalytic reactions, as the SAW brings an additional degree of freedom to the catalytic processes by supplying additional energy, lattice deformations and large dynamic electric fields and field gradients simultaneously. Until now, however, it is still unclear whether mechanocatalysis (substrate deformation) or electrocatalysis (large electric fields/gradients) is responsible for the observed impressive effects. Here, we aim to investigate experimentally the influence of SAW on various heterogeneous model catalytic processes, e.g. water splitting. Semiconductor materials with a metal or metal oxide doping proved very efficient as water splitting catalyst16. We will compare thin planar films with micro- and nanostructured surfaces (high resolution lith. at UCAM), nanosized particles and mesoporous solids of the same catalyst, e.g. TiO2. We will study the frequency-, wavelength- and amplitude dependence (CNR) of the catalytic rates and efficiencies (high-frequency IDT fabri- Expected Results: The energy necessary for water splitting can be delivered, e.g. sonochemically for a gold-containing titanium dioxide catalyst or – as shown before – by light, forming a photocatalytic reaction. As the main goal we aim for a strongly enhanced rate increase by combining ultrasound and photocatalysis for novel hybrid systems consisting of a (semiconducting) catalyst and an ultrasonic sound field. Long-term, we envision deposition of nanosized catalysts on panels with areas comparable to solar panels, as such large-scale coating of e.g. ZnO is already possible. ESR8-UAU1 will acquire broad knowhow in nanofabrication, surface chemistry, semiconductors, microfluidics and soft-matter physics and will be fully integrated in the Graduate Programme of the Cluster of Excellence NIM with access to a wide range of transferable-skill activities, workshops and schools. A. Wixforth, J. A. L. A. 11, 399 (2006); K. Sritharan et al., App. Phys. Lett. 88, 054102 (2006); S. Schneider et al., P. N. A. S. 104, 7899 (2007); Z. v. Guttenberg et al., Lab on a Chip 5, 308 (2005); T. Franke et al., Lab on a chip 10, 789 (2010). 14 Y. Inoue et al., J. Phys. Chem. 96, 2222 (1992); N. Saito et al., Appl. Surf. Sci. 259, 169 (2001); S. Kelling et al., Appl. Surf. Sci. 150, 47 (1999); Y. Inoue, Surf. Sci. Rep. 62, 305 (2007) 15 A. Kudo, Y. Miseki, Chem. Soc. Rev. 38, 253 (2009). 16 Candidate Profile: MSc or a diploma in physics, materials science, physical chemistry or comparable. A background in experimental catalysis or biophysics and cleanroom processing will be considered a plus. For further details about the project, please contact [email protected] home ESR9-UAU2 sawtrain/ind-research/esr9-uau2/page_32 Deterministic coupling of quantum dot mechano-excitons to high- quality SAW resonators (WP2-2) Host: Universität Augsburg (UAU) Supervision: Hubert J. Krenner, Co-supervisor: Mauricio de Lima (UVEG) Objectives: Excitons in semiconductor quantum dots (QDs) are highly sensitive probes for dynamic acoustic fields. In this project, the hired ESR will study the enhancement of the underlying fundamental optomechanical interactions between such mechano-excitons and a SAW in high-quality (Q) resonators. For this purpose he/she will hybridise QDs layers with high-Q SAW resonators on strong piezoelectric substrates: He/she will use an established epitaxial lift-off (ELO) technique to transfer epitaxially grown QD layers on top of optimized SAW resonators17. The ESR will design these resonators with fellow ESRs at UVEG. Using these hybrid devices, the ESR will explore enhancement or suppression of (i) acoustically regulated carrier injection18, (ii) spectral tuning19 and (iii) acoustic sideband generation and compare the obtained results to other acoustic techniques such as picosecond acoustics. Expected Results: The ESR will fabricate novel hybrid SAW devices and conduct a range of advanced optical experiments on these structures: He/she will receive beyondstate-of-the-art training in nanoscale device fabrication to transfer epitaxial semiconductor layers onto specially designed SAW resonators. Numerical simulations of these novel resonant acousto-mechanical devices form an integral part of the work. The optimisation of the acoustic performance will be pursued jointly with ESRs at UVEG in co-supervisor Mauricio Lima’s group. These team efforts will be promoted by mutual secondments of the ESRs. Moreover, the ESR will learn to apply advanced optical spectroscopy techniques with ultra-high spatial, spectral and temporal resolution to directly monitor optomechanical couplings in the time domain. These activities will be complemented by secondments at non-academic partners TREL and NTD to apply advanced quantum-optical and nanofabrication techniques. Candidate Profile: For this position, it is desirable to have a solid background condensed-matter physics and optics, ideally with a focus on semiconductor devices and nanophysics. Moreover, hands-on experience in state-of-theart cleanroom fabrication is highly advantageous. For further details about the project, please contact [email protected] 17 J. Pustiowski et al., Applied Physics Letters 106, 013107 (2015) 18 F. J. R. Schülein et al., Physical Review B 88, 085307 (2013). M. Weiß et al., Nano Letters 14, 2256-2264 (2014), F. J. R. Schülein et al., Nature Nanotechnology, AOP, doi:10.1038/nnano.2015.72 (2015). 19 home ESR10-UPM sawtrain/ind-research/esr10-upm/page_33 WP3-5 – SAW-modulated graphene for plasmonics and electronics Host: Universidad Politécnica de Madrid (UPM) Supervision: J. Pedrós, Co-supervisor: P. V. Santos (PDI) Objectives: Development of novel plasmonic and electronic devices in graphene using the charge-density modulation induced by a SAW, such as plasmon launchers and electron pumps. Firstly, the SAW strain field will be used as a dynamic grating to couple light to propagating plasmons in graphene20. Plasmons will be assessed first optically21, and then electrically, using the modulation of the response of nanoelectronic devices22. Secondly, the SAW piezoelectric field will be used to induce a current in graphene23. Tailoring adequate bilayer-graphene nanostructures may lead to single-electron (or -hole) SAW pumps. TWENTE will provide complementary fabrication facilities, PDI, UCAM, and Protemics advanced characterization techniques, CSIC and UCM theoretical calculations. Expected Results: Study and control of charge-density modulation induced by ultrahigh-frequency SAWs in graphene and development of SAW-driven devices. ESR training comprises (i) chemical vapour deposition of graphene and transfer techniques, (ii) material characterization (Raman, Dirac point, magnetotransport), (iii) fabrication of nanoscale devices by e-beam and nanoimprint (secondment at TWENTE) lithography, (iv) advanced spectroscopy for the assessment of the SAW-induced modulation (Raman microscopy and interferometry, secondment at PDI), (v) plasmon generation and detection (including THz, secondment at Protemics), and (vi) low-noise electrical measurements at low temperatures (including 300 mK, secondment at UCAM). Candidate Profile: MSc or diploma in physics or electrical engineering. A background in experimental solid-state physics, and more specifically in graphene, plasmonics, acoustics, and/ or spectroscopy will be considered a plus. For further details about the project, please contact [email protected] Figure 14: SAW-assisted plasmon launcher in graphene J. Schiefele, J. Pedrós, F. Sols, F. Calle, and F. Guinea, Phys. Rev. Lett. 111, 237405 (2013). 20 21 H. Yan, T. Low, W. Zhu, Y. Wu, M. Freitag, X. Li, F. Guinea et al., Nat. Photonics 7, 394 (2013). N. Ittah and Y. Selzer, Nano Lett. 11, 529 (2011). 22 V. Miseikis et al., Appl. Phys. Lett. 100, 133105 (2012). 23 ESR11-CNRS sawtrain/ind-research/esr11-cnrs/page_34 Single-electron electronics and quantum optics with flying electrons (WP3-3) Host: Neel Institut (CNRS) Supervision: C. Bäuerle (CNRS), Co-supervisor: C.J.B. Ford (UCAM) Objectives: In this project we will build on recent advances on single-electron transport assisted by SAWs24 where flying electrons have been transported by a SAW, demonstrating high fidelity for both single-electron emission and single-electron detection. This opens the possibility to perform quantum-optics experiments with electrons in solid-state devices. Since electrons in solids are strongly interacting particles, new quantum-entanglement schemes can be envisioned, not possible with photons. Our goal is to develop all the basic elements needed to realise quantum-optics experiments with flying electrons such as beam splitters, phase control and controlled interaction. This can be achieved by bringing two SAW channels together and tunnel-coupling them over a distance of several microns. One can also exploit the Coulomb interaction to control the phase of a single electron on the fly. Putting all these blocks together should allow the realisation of a controlled phase gate for flying electrons, a two-qubit gate. ESR will characterise the samples at low temperature, learn about sophisticated RF detection techniques and investigate charge- as well as spin-coherent properties of flying electrons. By interacting with UCAM and PDI the ESR will learn complementary techniques (optical rather than electrical detection). Figure 15: Single-electron transport between two distant quantum dots using a SAW24. S. Hermelin et al., Nature 477, 435 (2011); R. P. G. McNeil et al., Nature 477, 439 (2011). 24 Candidate Profile: Expected Results: ESR11-CNRS will fabricate the SAW devices, learning all basic nanofabrication steps (laser and e-beam lithography). Optimisation of IDTs in collaboration with PDI and TWENTE will be important for maximal IDT efficiency. The MSc or a diploma in physics or electrical engineering. A background in experimental solid-state physics and/or nanofabrication would be advantageous. For further details about the project, please contact [email protected] home ESR12-UCAM1 sawtrain/ind-research/esr12-ucam1/page_35 SAW driven source of polarised single photons (WP3-2) Host: Cambridge University, Cambridge (UCAM) Supervision: C.J.B. Ford, Co-supervisor: C. Bäuerle (CNRS). Objectives: In this project we will build on recent advances in which we transported single electrons back and forth between two quantum dots using SAWs.24 For a single-photon source (SPS), and then for electron-spin to photon-polarisation conversion, a SAW needs to transport a stream of single electrons into a region of holes. UCAM has developed devices in which both electrons and holes can be induced in an undoped GaAs/AlGaAs well by gates to form a lateral n-p junction. A SAW drags electrons across the junction. A ZnO layer will be deposited to enhance the SAW amplitude (comparing techniques with PDI/TWENTE). Quantised SAW-driven current between electron and hole regions will be studied and UCAM’s new 300 mK scanning optical microscope will be used to detect light emission as each electron recombines with a hole in a high-density hole gas. Single photons should be emitted with a high repetition rate (ultimately e.g. 3GHz, though initially only 0.01% will be collected) and low jitter (<100ps). Devices for spin-polarising electrons, developed in WP3-3 at CNRS, will be adapted so that a SAW pulse transfers a spin-polarised electron to the hole gas, emitting a photon with circular polarisation matching the electron’s spin if it travels along the spin-quantisation axis. ESR will discuss results with theorists (WP3-4). To increase directionality and efficiency, later devices will use Bragg mirrors below and above the emitter (developed at PDI in WP3-1 and already used by TREL), keeping compatibility with induced devices. The strong similarities with WP1-1 (using Si at TWENTE) will be exploited. Expected Results: ESR12-UCAM1 will fabricate SAW devices, learning the many fabrication techniques associated with optical and e-beam lithography and also characterisation methods (SEM, AFM, XRD). The ESR will learn RF electrical techniques and will make ultra-low current measurements of their devices to confirm quantised acousto-electric current, in cryostats at 4K and 300mK. The ESR will look for single photons using techniques learned at CHALMERS and PDI and photon-timing detectors and electronics loaned by TREL. They will incorporate spin-polarisation techniques learned at CNRS to design devices to convert electron spin to photon polarisation. Candidate Profile: MSc in physics or electrical engineering. A background in experimental solid-state physics, optics and/or nanofabrication would be advantageous. For further details about the project, please contact [email protected] home ESR13-UCAM2 sawtrain/ind-research/esr13-ucam2/page_36 Theory of electron transport and electron-to-photon qubit conversion (WP3-4) Host: Cambridge University, Cambridge (UCAM) Supervision: C.H.W. Barnes, Co-supervisor: A. Harju (AALTO). Objectives: ESR13-UCAM2 under Prof. Barnes will make accurate simulations of an electron recombining with a hole to produce a photon in UCAM‘s device structures, investigating the requirements for preserving qubit coherence rather than just measuring the spin. Associate partner AALTO will work on the modelling of the electron and spin transport by SAW-driven QDs, using accurate many-body techniques to propagate the few-particle wave functions, in conjunction with ESR13-UCAM2. The simulations can be a tool to understand experiments, but can also simulate and screen suggestions for the experimental work. The ESR will learn about conversion between photons and spins in GaAs from experimentalists who have measured it at PDI and will discuss results with ESR12-UCAM1 (WP3-2), ESR11-CNRS (WP3-3) and ESR2-PDI2 (WP3-1). Expected Results: ESR13-UCAM2 will learn techniques for modelling of SAW-driven electrons and electron-hole recombination, and analytical calculations of an entangled electron, hole and photon. ESR13-UCAM2 will be seconded to associate partner AALTO each year, to combine expertise of the two theoretical groups, and to join forces to speed up computation using clusters of graphics processing units (GPUs). The ESR will also visit PDI to gain an understan- ding of the principles of photon-to-spin and spin-to-photon conversion from experimentalists. Figure 17: SAW driven lateral n-p junction Candidate Profile: Candidates should have an MSc in physics, a strong background in quantum condensed matter physics, and a keen interest in numerical computation. For further details about the project, please contact [email protected] home ESR14-TREL sawtrain/ind-research/esr13-ucam2/page_37 Monolithic and hybrid quantum photonic devices (WP2-1) Host: Toshiba Research Europe Ltd. (TREL) Supervision: A. J. Shields, Co-supervision: C. Ford (UCAM) Objectives: This project aims to acousto-mechanically tune QD excitons into resonance with a localized photonic mode of a microcavity, so that the SAW dynamically controls the Purcell effect. This in turn gives rise to a regulated, deterministic and triggered single-photon (SP) emission. Using state-of-the-art cleanroom fabrication, ESR14-TREL will monolithically integrate etched and planar microcavities containing single QDs on GaAs to assess the optimum microcavity platform for the implementation of this scheme for operation frequencies >1 GHz. ESR14-TREL will build on expertise on SAW tuning of QD excitons at TREL and microcavity tuning of partners PDI and UAU, studying light-emission characteristics (coherence and SP emission purity) using time-correlated SP-counting (TCSPC) spectroscopy. ESR14-TREL will then transfer electrically active microcavities SP LEDs on to a LiNbO3 substrate for enhanced acousto-mechanical control. This includes device design and fabrication by ELO with ESR9-UAU2. In addition to the spectral tuning, such a hybrid device, jointly realized by two ESRs from the academic and non-academic sector, allows for acoustic regulation of the carrier injection and dynamic programming of the QD charge state at GHz frequencies. Expected Results: ESR14-TREL will be trained in semiconductor device design, fabrication and characterisation. The ESR will be taught the use of semiconductor device modelling tools for both electronic and photonic structures. Fabrication training will take place during extended secondments at UCAM and UAU. The ESR will have access to the facilities at TREL for different types of micro- and quantum-optical measurements. Candidate Profile: Candidates should have (or be about to receive) a BSc/ MSc or Diplom in Physics, Electrical Engineering or related discipline. Knowledge of semiconductor device physics or optical spectroscopy would be an advantage. For further details about the project, please contact [email protected] home ESR15CHALMERS sawtrain/ind-research/esr15-chalmers/page_38 Propagating acoustic fields at the single-phonon level (WP2-4) Host: Chalmers Tekniska Hoegskola (CHALMERS) Supervision: P. Delsing, Co-supervisor: P.V. Santos (PDI). Objectives: The Chalmers group has recently shown that surface acoustic waves can be coupled to superconducting qubits at the quantum level. This open up new and exciting possibilities to do single phonon physics. By first electrically exciting the qubit and then letting it decay by emitting a single phonon, it is possible to implement a high-fidelity single phonon source. Expected Results: The PhD student will design and fabricate samples with IDT transducers and transmons. He/she will collaborate with other PhD student within the SAWtrain network. The student will optimize the IDTs for optimum energy conversion between the electrical to the mechanical domains. The PhD student will visit PDI and TWENTE to fabricate high-frequency IDTs. He/she will perform reflection/transmission measurements to verify the nonlinear coupling between the SAW and the qubit and extract the coupling strength. The PhD student will build a single-phonon source and verify its operation by measuring the second-order correlation fun- ction of the outgoing mechanical signal, as converted to the electrical domain by the IDT. Candidate Profile: Candidates with experience on acousto-optics, integrated photonics, surface acoustic waves, solid state physics, and clean-room operation will be favored For further details about the project, please contact [email protected] home How to apply? We offer… We require… Application procedure Recruitment procedure 40 40 41 42 43 How to apply? home sawtrain/application/how-to/page_40 We offer… • An excellent PhD programme with co-tutorship in world leading research institutions. A description of the different PhD research projects can be found starting on page 23. How to apply? SAWtrain is hiring 15 early stage researchers (ESRs, PhD candidates) with excellent records who are interested in pursuing a PhD programme. The candidates can be from anywhere in the world and there are no restrictions regarding nationality. However, candidates have to comply with the EU eligibility criteria and with the EU mobility rules for ESRs (see below). • A Marie-Curie Scholarship including: –– A 36-month contract –– a very attractive salary, benefits, as well as mobility and family allowances (for details see the „Guide for Applicants“ for the Marie Skłodowska-Curie Actions) • In addition to the individual PhD scientific projects, all ESRs will benefit from continuing education, which includes internships and secondments, a variety of training modules as well as transferable skills courses and active participation in workshops and conferences. home sawtrain/application/requirements/page_41 We require… • Qualification –– A Master’s degree in Physics, Materials Science, Engineering, or a related field. • English Proficiency –– You must possess adequate English skills (ability to understand and express yourself in both written and spoken English) for joining the network. Please note that some of the partners have special requirements regarding English proficiency for their PhD programme. • You must comply with the EU eligibility criteria and with the EU mobility rules for ESRs: –– Early stage researchers (ESR) are those who, at the time of recruitment by the host organization, are in the first four years (full-time equivalent research experience25) of their research careers and have not yet been awarded a doctoral degree. –– Candidates must not have resided or carried out their main activity (work, studies, etc.) in the country of their host organisation for more than 12 months in the 3 years immediately prior to the reference date.26 Compulsory national service or short stays such as holidays are not taken into account. These criteria are described in the Marie Skłodowska-Curie ITN Grant Agreement, and in the MSCA Guide for Applicants of the European commission. You may consult these directives to find out more about Marie Skłodowska-Curie Actions. Initiative, leadership, and commitment to participate in all network activities, in particular those associated with the internships (secondments) for the PhD projects listed in Figures 4 to 6. Full-time equivalent research experience is measured from the date when they obtained the degree which would formally entitle them to embark on a doctorate, either in the country in which the degree was obtained or in the country in which the research training is provided, irrespective of whether or not a doctorate is envisaged. Candidates for an ESR position can be of any nationality. (European Commission Decision C (2014)4995 of 22 July 2014.) 25 26 Note that the mobility rule applies to the beneficiary where the researcher is recruited, and not to beneficiaries to which the researcher is sent or seconded. It is also only determined at one point in time: that of the fellow‘s first recruitment in the project (Marie Skłodowska-Curie Actions, Guide for Applicants Innovative Training Networks 2014). home sawtrain/application/procedure/page_42 Application procedure deadline June 21, 2015! For the application, the candidates must supply the following items: 1. The application form. In this form, you may specify up to three PhD projects you are interested in (in order of preference). Please fill the form, save it in your computer, and then email it together with the rest of the documentation to [email protected] 2. A motivation letter that describes: –– why you are interested in a PhD (brief statement of research interest) –– what makes the SAWtrain programme interesting to you –– why do you think you are a suitable candidate for the chosen PhD project(s) 3. A complete CV (personal details, academic/education history, research experience, experimental skills, publications etc.) 4. Contact details of two referees, who can provide a reference and, preferably, with whom you have worked before 5. Copies of your certificates (Bachelor, Diploma or MSc.) as well as your transcripts of grades 6. If available, proof of proficiency in the English language 7. The application should be sent in before June 21st, 2015 Applications should be sent to [email protected] For questions about the application procedure, please contact us via [email protected] home sawtrain/application/procedure/page_43 Recruitment procedure and evaluation process The recruitment procedure will comply with the "The European Charter and Code for Researchers” (i.e. “The Code of Conduct for Recruitment”) to guarantee an open, transparent, impartial, and equitable recruitment strategy. The Recruitment Board of the SAWtrain network will be in charge of the evaluation of the applicants and will provide a detailed information during the hiring process. home Further reading A short glossary Closing and Acknowledgements 45 48 51 Attachments home sawtrain/attachments/further-reading/page_45 Further reading Marie Skłodowska-Curie Actions and Innovative Training Networks: Research articles related to SAWs: • • • • • Materials, generation and detection Marie Skłodowska-Curie ITN Grant Agreement Horizon 2020 Work Programme 2014-2015 MSCA Guide for Applicants The European Charter and Code for Researchers Book and reviews: • Acoustic and phononics –– B. A. Auld, Acoustic Fields and Waves in Solids (Robert E. Krieger Publishing Company, Inc.),1990 –– D. Royer and E. Dieulesaint, Elastic Waves in Solids (Springer, Heidelberg), 2000 –– Korpel, Acousto-Optics (Marcel Dekker, Inc., New York), 1997 –– M. Maldovan, Sound and heat revolutions in phononics, Nature 530, 209 (13) • Surface acoustic waves –– D. P. Morgan, History of surface acoustic wave devices, Int. J. High Speed Electron. Syst. 10, 533 (2000) –– R. M. White, Surface Elastic Waves, Proc. of the IEEE 58 (IEEE, New York), p. 1238 (1970). –– A. Oliner, Acoustic Surface Waves, (Springer, Berlin), 1994. –– M. M. de Lima, Jr. and P. V. Santos, Modulation of photonic structures by surface acoustic waves, Rep. Prog. Phys. 68, 1639 (2005). –– L. Garcia-Gancedo et al., Room-temperature remote-plasma sputtering of c-axis oriented zinc oxide thin films, J. Appl. Phys., 112, 014907 (2012). –– J. G. Rodríguez-Madrid, et al., Ultra high frequency SAW resonators on AlN/diamond: the influence of the piezoelectric film thickness, IEEE Electron Dev. Lett. 33, 495 (2012). –– J. Pedrós et al., Low attenuation of GHz Rayleigh-like surface acoustic waves in ZnO/GaAs systems immersed in liquid helium, Appl. Phys. Lett. 102, 043507 (2013). –– A .Ohtomo and H.Y. Hwang, A high-mobility electron gas at the LaAlO3/SrTiO3 heterointerface Nature 427, 423 (2004). –– A. Brinkman et al., Magnetic effects at the interface between non-magnetic oxides, Nature Materials 6, 493 (2007). –– N. Reyren et al., Superconducting Interfaces Between Insulating Oxides, Science 317, 1196 (2007). • Graphene –– J. Schiefele, J. Pedrós, F. Sols, F. Calle, and F. Guinea, Coupling Light into Graphene Plasmons through Surface Acoustic Waves, Phys. Rev. Lett. 111, 237405 (2013). –– H. Yan, T. Low, W. Zhu, Y. Wu, M. Freitag, X. Li, F. Guinea et al., Damping pathways of mid-infrared plasmons in graphene nanostructures, Nat. Photonics 7, 394 (2013). home –– N. Ittah and Y. Selzer, Electrical Detection of Surface Plasmon Polaritons by 1G0 Gold Quantum Point Contacts, Nano Lett. 11, 529 (2011). –– V. Miseikis et al., Acoustically induced current flow in graphene, Appl. Phys. Lett. 100, 133105 (2012). –– P. V. Santos et al., Acousto-electric transport in epitaxial monolayer graphene on SiC, Appl. Phys. Lett. 102, 221907 (2013) –– Vozmediano et al., Gauge fields in graphene, Phys. Rep. 496, 109 (2010) –– C.-H. Park et al, New Generation of Massless Dirac Fermions in Graphene under External Periodic Potentials, Nano Lett. 8, 2920 (2008); Phys. Rev. Lett. 101, 126804 (2008) • PhoXonics: phononics and photonics –– J. Pedrós et al., Voltage tunable surface acoustic wave phase shifter on AlGaN/GaN, Appl. Phys. Lett. 96, 123505 (2010). –– D. A. Fuhrmann, et al., Dynamic modulation of photonic crystal nanocavities using gigahertz acoustic phonons, Nature Photon. 5, 605 (2011). –– M. M. de Lima et al., Compact Mach-Zehnder acousto-optic modulator , Appl. Phys. Lett. 89, 121104 (2006). –– Beck et al. European Patent 1990677B1, Device and method for modulating light. –– Capmany et al. WO2012152977A1, Dispositif awg syntonisable pour la multiplexation et la démultiplexation de signaux et procédé de syntonisation de ce dispositif. –– M. M. de Lima et al., Surface Acoustic Bloch Oscillations, the Wannier-Stark Ladder, and Landau-Zener Tunneling in a Solid, Phys. Rev. Lett. 104, 165502 (2010). –– M. M. de Lima et al., Surface Acoustic Bloch Oscillations, the Wannier-Stark Ladder, and Landau-Zener Tunneling in a Solid, Appl. Phys. Lett. 100, 261904 (2012). sawtrain/attachments/further-reading/page_46 –– J. Pustiowski et al., Independent dynamic acousto-mechanical and electrostatic control of individual quantum dots in a LiNbO3-GaAs hybrid, Appl. Phys. Lett., 106, 013107 (2015). –– F. J. R. Schülein et al., Acoustically regulated carrier injection into a single optically active quantum dot, Physical Review B 88, 085307 (2013). • Quantum dots and wires –– M. Weiß, et al., Dynamic acoustic control of individual optically active quantum dot-like emission centers in heterostructure nanowires, Nano Lett. 14, 2256-2264 (2014). –– Lounis, B. & Orrit, M. Single-photon sources. Rep. Prog. Phys. 68, 1129–1179 (2005). –– O.D.D. Couto, Jr. et al., Photon anti-bunching in acoustically pumped quantum dots, Nat. Phot. 3, 645 (2009). –– S. Lazic et al., Mechanism of non-classical light emission from acoustically populated (311)A GaAs quantum wires, New J. of Phys. 14, 013005 (2012). –– F. Alsina et al., Real-time dynamics of the acoustically induced carrier transport in GaAs quantum wires, Phys. Rev. B 67, 161305R (2003). • Quantum Transport –– Quantum Oscillations in the Surface-Acoustic-Wave Attenuation Caused by a Two-Dimensional Electron System, A. Wixforth, J. P. Kotthaus, G. Weimann, Phys. Rev. Lett. 56, 2104 (1986). –– On-demand single-electron transfer between distant quantum dots, McNeil R. et al., Nature, 477, 439 (2011). home sawtrain/attachments/further-reading/page_47 –– Coherent time evolution of a single-electron wave function, Kataoka M. et al., Phys. Rev. Lett., 102, 156801 (2009). –– Fast and efficient single electron transfer between distant quantum dots, S. Hermelin et al., J. Appl. Phys. 113, 136508 (2013). –– Electrical control of a solid-state flying qubit, M. Yamamoto, et al., Nature Nanotech. 7, 247-251 (2012). –– Electrons surfing on a sound wave as a platform for quantum optics with flying electrons, S. Hermelin et al., Nature 477, 435-438 (2011). –– Quantum computation using electrons trapped by surface acoustic waves, Barnes C. H. W., et al., Phys. Rev. B 62, 8410 (2000). • Quantum Phononics –– Gustafsson, M.V. et al., Propagating phonons coupled to a superconducting qubit. Science 346, 207(2014). –– Kockum, A.F., Delsing, P. & Johansson, G., Designing frequency-dependent relaxation rates and Lamb shifts for a giant artificial atom. Physical Review A 90 013837, (2014). –– Gustafsson, M.V. et al, Local probing of propagating acoustic waves in a gigahertz echo chamber. Nature Physics 8, 338-343(2012). • Catalysis, microfluids and biological applications –– S. W. Schneider, et al., Shear-Induced Unfolding Triggers Adhesion of Von Willebrand Factor Fibers, Proc. Nat. Acad. Sci. 104, 7899 (2007). –– Z. v. Guttenberg, H. Mueller, H. Habermueller, A. Geisbauer, J. Pipper, J. Felbel, M. Kielpinski, J. Scriba, A. Wixforth, Planar Chip Device for PCR and Hybridization with Surface Acoustic Wave Pump, Lab on a Chip 5, 308 (2005). –– A. Wixforth, Acoustically Driven Programmable Microfluidics for Biological and Chemical Applications, JALA 11, 399 (2006). –– K. Sritharan et al., Acoustic mixing at low Reynold’s numbers, App. Phys. Lett. 88, 054102 (2006). –– S. Schneider et al., Shear-induced unfolding triggers adhesion of von Willebrand factor fibers, P. N. A. S. 104, 7899 (2007). –– Z. v. Guttenberg et al., Planar chip device for PCR and hybridization with surface acoustic wave pump, Lab Chip 5, 308 (2005). –– T. Franke et al., Recent advances in particle and droplet manipulation for lab-on-a-chip devices based on surface acoustic waves, Lab Chip 10, 789 (2010). –– Y. Inoue et al., Effect of surface acoustic wave propagated on ferroelectric lithium niobate (LiNbO3) on catalytic activity of a palladium deposited thin film, J. Phys. Chem. 96, 2222 (1992). –– N. Saito et al., Acoustic wave effects on catalysis: design of surfaces with artificially controllable functions for chemical reactions, Appl. Surf. Sci. 259, 169 (2001). –– S. Kelling et al., Surface morphological changes induced in catalysts by acoustic waves, Appl. Surf. Sci. 150, 47 (1999). –– Y. Inoue, Effects of acoustic waves-induced dynamic lattice distortion on catalytic and adsorptive properties of metal, alloy and metal oxide surfaces, Surf. Sci. Rep. 62, 305 (2007). –– A. Kudo, and Y. Miseki, Heterogeneous photocatalyst materials for water splitting, Chem. Soc. Rev. 38, 253 (2009). home A short glossary sawtrain/attachments/short-glossary/page_48 ESR������������������������������������������������The ESRs within SAWtrain are the fellows pursing a PhD degree. The shortcut stands for “Early Stage Researcher” and corresponds to a researcher in the early stage of her/ his career (within four years from the last academic degree, see the EU eligibility rules for details. IDT��������������������������������������������������Interdigital transducer for the generation of surface acoustic waves IPR��������������������������������������������������Intellectual property rights KET������������������������������������������������Key enabling technology PCDP��������������������������������������������Personal Career Development Plan—the complete training plan (including research project, secondments, courses, etc.) to be followed by ESR during the SAWtrain PhD programme SAW����������������������������������������������Surface acoustic wave Secondment���������������������������Internship at another institution carried out as a part of the training programme SHF������������������������������������������������Super high frequency SME�����������������������������������������������Small and medium-sized enterprises SPS������������������������������������������������Single-photon-source TTW����������������������������������������������Topical training workshop UHF������������������������������������������������Ultra high frequency VHF������������������������������������������������Very high frequency WP��������������������������������������������������Work package home sawtrain/attachments/short-glossary/page_49 SAWtrain Beneficiaries CNR�����������������������������������������������Institute of Acoustic and Sensors Corbino – Consiglio Nazionale delle Ricerche, Roma, Italy CNRS��������������������������������������������Institut Neel – Centre National de la Recherche Scientifique, Grenoble, France PDI��������������������������������������������������Paul-Drude-Institut für Festkörperelektronik, Forschungsverbund Berlin, Berlin, Germany TWENTE������������������������������������Universiteit Twente, Enschede, The Netherlands UAU�����������������������������������������������Universität Augsburg, Augsburg, Germany UCAM�������������������������������������������Cambridge University, Cambridge, United Kingdom UPM�����������������������������������������������Universidad Politécnica de Madrid, Madrid, Spain UVEG�������������������������������������������Universitat de València, Valencia, Spain TREL����������������������������������������������Toshiba Research Europe Ltd., Cambridge, United Kingdom CHALMERS�����������������������������Chalmers Tekniska Hoegskola, Göteborg, Sweden home sawtrain/attachments/short-glossary/page_50 SAWtrain Associated Partners AALTO�����������������������������������������Aalto University, Espoo, Finland CSIC���������������������������������������������Consejo Superior de Investigaciones Científicas, Madrid, Spain Deutsches Museum����������Deutsches Museum, Munich, Germany EPCOS����������������������������������������EPCOS AG, Germany Humboldt����������������������������������Humboldt Graduate School, Berlin, Germany Leeds��������������������������������������������University of Leeds, Leeds, UK Mach8lasers���������������������������Mach8lasers B.V., Breda, The Netherlands NT&D��������������������������������������������NT&D, Germany NTT-BRL������������������������������������Nippon Telephone & Telegraph Corp. – Basic Research Laboratories, Atsugi, Japan PicoQuant��������������������������������PicoQuant GmbH, Berlin, Germany Protemics����������������������������������Protemics GmbH, Aachen, Germany Queens ��������������������������������������Queen’s University, Kingston, Canada SOLMATES������������������������������SolMateS B.V., Enschede, The Netherlands UCM����������������������������������������������Universidad Complutense de Madrid, Madrid, Spain VLC Photonics����������������������VLC Photonics S.L., Valencia, Spain home sawtrain/attachments/closing/page_51 Closing and Acknowledgements Editors: • Paulo V. Santos • Mauricio M. de Lima • Jan T. Philippen Disclaimer: The Grant Agreement (GA) will be signed within May. Until the GA is not signed there are no guarantees for the funding. We will announce the signature of the GA as soon as possible. This booklet is published within the framework of the SAWtrain network, part of the call H2020-MSCAITN-2014. Layout and Production: • fredfunk&aufsiemitgebruell www.fredfunk.de –– Illustration: • Waves - Dennis Mertsch (aufsiemitgebruell) • Diagramms & other - Fred Funk This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 642688. home