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HL: Fachverband Halbleiterphysik
HL 42: Optical Properties of Quantum dots: Theory and Simulation
HL 42.5: Talk
Thursday, February 28, 2008, 10:45–11:00, EW 201
The phonon bottleneck revisited at low temperatures — •Jan Seebeck1, Paul Gartner1,2, and Frank Jahnke1 — 1Institute for Theoretical Physics, University of Bremen, Germany — 2National Institute for Materials Physics, Bucharest-Magurele, Romania
The application of semiconductor quantum dots in optoelectronic devices requires efficient carrier-scattering processes. For low carrier densities the interaction with LO phonons provides fast scattering channels, which can be understood by describing carriers as polarons.
Within a quantum kinetic many-body theory we revisit the phonon bottleneck problem. For low temperatures, an asymptotic phonon bottleneck is observed, where after an initial redistribution of carriers the carrier kinetics freezes, not reaching a thermal distribution in terms of the Kubo-Martin-Schwinger condition. Also non-Markovian effects in the dephasing properties as well as intermediate polar coupling nitride materials are discussed.