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HL: Fachverband Halbleiterphysik
HL 29: Quantum dots: Optical properties II
HL 29.7: Vortrag
Mittwoch, 25. März 2009, 11:15–11:30, BEY 154
Resonant Raman and resonant photoluminescence spectroscopy on quantum-dot helium — •Tim Köppen1, Dennis Franz1, Andreas Schramm2, Christian Heyn1, Detlef Heitmann1, and Tobias Kipp1 — 1Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Germany — 2Optoelectronics Research Center, Tampere University of Technology, Finland
We investigate electronic excitations in InGaAs quantum dots containing two electrons, also called artificial quantum-dot helium, by resonant optical spectroscopy in magnetic fields. In order to match the quantum dot ground state transition energy to both the sensitivity range of our detector and the emission energy range of our laser we rapidly thermally annealed the samples. The occupation of the quantum dots with electrons can be precisely controlled and monitored by applying a voltage between a back contact and a gate of our sample and by measuring the capacitance. The quantum-dot helium is the most fundamental system to investigate many-particle effects induced by Coulomb interaction. We observe optical transitions in the quantum dots provoked by resonant Raman and resonant photoluminescence spectroscopy.
This project is supported by the Deutsche Forschungsgemeinschaft via SFB 508 “Quantenmaterialien".