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HL: Fachverband Halbleiterphysik
HL 31: Quantum dots and wires: Optical properties III
HL 31.8: Vortrag
Mittwoch, 28. März 2007, 16:45–17:00, H17
Quantum kinetics of polarons in semiconductor quantum dots — •Jan Seebeck1, Paul Gartner1,2, and Frank Jahnke1 — 1Institute for Theoretical Physics, University of Bremen, Germany — 2National Institute for Materials Physics, Bucharest-Magurele, Romania
For applications of semiconductor quantum dots (QDs) in optoelectronic devices efficient carrier scattering processes are necessary. We study carrier-phonon scattering within a quantum kinetic theory of the interacting many-body system, where carriers are described as polarons. At elevated temperatures and low carrier densities, the interaction of carriers with LO phonons in semiconductor QDs leads to fast scattering channels even in QDs where the level spacing does not match the LO-phonon energy.
To investigate carrier dynamics experimentally, most pump-probe experiments are performed at low temperatures. We show, that even at low temperatures fast carrier scattering can be obtained with our theory due to the combined influence of polaron satellites and non-Markovian effects.