Dresden 2009 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 48: Poster 2

HL 48.65: Poster

Thursday, March 26, 2009, 15:00–17:30, P2

Time-resolved Phonon Interactions in InAs/GaAs Quantum Dots — •Stefan Werner, Patrick Zimmer, Julia Kabuß, Martin Richter, Axel Hoffmann, and Andreas Knorr — Institut für Festkörperphysik, TU Berlin, EW 5-1, Hardenbergstraße 36, 10623 Berlin, Deutschland

We present a time- and temperature-resolved photoluminescence study of different carrier-phonon interactions in self-organized InAs/GaAs quantum dots (QD) under resonant excitation of the QD system. Resonant excitation leads to an enhancement of cross-sections of processes attributed to phonon interactions, like Raman scattering or hot-electron luminescence. Resonant PL techniques enable us to retrieve the energies of localized phonon modes. Time-resolved PL measurements allow us to differentiate between coherent and incoherent phonon-coupled processes. For the QD LO-phonon mode (34.6 meV), a very short radiative lifetime of under 30 ps is found, giving proof of the coherent character of the Raman scattering. In addition, temperature-dependent measurements are performed. Our results are compared with theoretical calculations.