P.R.I.M.E. project: S emiconductor nanoplasmonics

1. Semiconductor nanoplasmonics Doris Reiter Institut für Festkörpertheorie Universität Münster, Münster, Germany Doris.Reiter@uni-muenster.de 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 • Phonon dynamics, squeezed phonons, generation of phonon wave packets • Coherent spin dynamics, switching of spin states, time-resolved optical signals • Twisted light-matter interaction • 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, ... Mz= - 5/2 Example: Quantum dot doped with a single Manganese (Mn) atom P.R.I.M.E. project: Semiconductor nanoplasmonics Mz=+3/2 • 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 Mz= - 1/2 • Bringing together the best of two world: nanoscaled semiconductors and plasmonic structures • Nanostructured metal gives ultimate control over light field:localisation and enhancement of light field • Light-matter interaction with semiconductor nanostructures • Modified transitions can be excited • Very beneficial due to high controllability