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This project has received funding from the Federal Ministry of Education and Research and the European Union’s Seventh Framework Programme for research, technological development and demonstration under grant agreement no 605728 Semiconductor nanoplasmonics Doris Reiter Institut für Festkörpertheorie Universität Münster, Münster, Germany [email protected] Research field: Theoretical semiconductor physics Research interests: Ultrafast dynamics in quantum dots Semiconductors are widely used in computers, smartphones... Theoretical modelling of dynamical processes in semiconductors Nanostructuring allows for new, fascinating effects Specific nanostructure: quantum dots Optical control of quantum dots, state preparation, dephasing of excitonic states Size of a few nanometers (1 nm=0.000 000 001 m) Fabricated of semiconducting materials: tailored structures Properties similar to atoms, but consist of about 104 atoms Applications: Optoelectronics, lasers, LEDs, quantum information, quantum cryptography, solar cells, ... Example: Quantum dot doped with a single Manganese (Mn) atom Phonon dynamics, squeezed phonons, generation of phonon wave packets Coherent spin dynamics, switching of spin states, timeresolved optical signals Twisted light-matter interaction P.R.I.M.E. project: Semiconductor nanoplasmonics Mn has six spin states “quantum dice” Switching into each spin states by optical excitation Visible in time-resolved spectra by shift of the absorption line Bringing together the best of two world: nanoscaled semiconductors and plasmonic structures Nanostructured metal gives ultimate control over light field: Mz= - 5/2 Mz=+3/2 Mz= - 1/2 localisation and enhancement of light field Light-matter interaction with semiconductor nanostructures Modified transitions can be excited Very beneficial due to high controllability