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(Form n°1)
Subject of the thesis
Thesis Advisor
First Name :
Surname : Lauret
Phone :
01 69 35 21 32
E-mail :
[email protected]
Laboratory : Laboratoire Aimé Cotton
Phone : 01 69 35 20 06
Director : JF Roch
Web site :
E-Mail : [email protected]
Address : Campus d’Orsay, Bât 505 91405 Orsay
Place of work : ORsay
THESIS TITLE : Optical porperties of Graphene Nanoribbons and Qdots
The development of on-chip photonics lacks integrated nano light sources, in particular emitting in the
infrared below the gap of semiconductors such as Silicon and GaAs. In this view, carbon nanostructures
are good alternatives to common semiconductors. In order to make them foregrounds objects for these
applications a lot of academic studies are needed. This PhD will focus on the study of Graphene Quantum
Dots and Graphene NanoRibbons synthesized by ‘bottom-up’ organic chemistry as new infrared
integrated photon sources. On the contrary to common physical synthesis routes, this approach will lead to
well defined objects with a well controlled degree of confinement (0D1D), and well defined edges. This
is important since all the electronic properties are governed by the degree of confinement and the nature
of the edges. The goal is to use state of the art chemistry to tune and study new physical properties.
Indeed, these objects are at the frontier between solid state physics and molecular physics leading to
uncommon behaviour in the electronic properties.
The emission wavelength will be controlled by varying the lateral size of the carbon nanostructures. The
interaction with the environment will be studied in the view of using it as a lever to control the electronic
properties of these nanostructures. Moreover, the influence of the confinement on different physical
phenomena will be probed by a continuous variation of the dimensionality from 0D to 1D. In particular,
the influence of the confinement on many body effects will be studied. The influence of the degree of
confinement on the statistics of the emitted photons will be also investigated thanks to Hanbury Brown
and Twiss experiments. This will lead to a control of the photon antibunching at room temperature and at
telecommunication wavelengths.
The applicant will use state of the art microphotoluminescence setup both at room and cryogenic
temperatures. Time resolved experiments will also be performed. The applicant should have a good
knowledge of optics and solid state physics.
Keys words : Graphene, semiconductors, photoluminescence
Application to a fellowship of EDOM