Quantum kinetic approach to electron-LO-phonon relaxation: Is there a phonon bottleneck problem in optoelectronic devices?

P. Gartner; J. Seebeck; F. Jahnke

doi:10.1117/12.717238

7 February 2007 Quantum kinetic approach to electron-LO-phonon relaxation: Is there a phonon bottleneck problem in optoelectronic devices?

P. Gartner, J. Seebeck, F. Jahnke

Author Affiliations +

Proceedings Volume 6468, Physics and Simulation of Optoelectronic Devices XV; 646816 (2007) https://doi.org/10.1117/12.717238
Event: Integrated Optoelectronic Devices 2007, 2007, San Jose, California, United States

Abstract

The time evolution of optically excited carriers in semiconductor quantum wells and quantum dots is analyzed for their interaction with LO-phonons. Both the full two-time Green's function formalism and the one-time approximation provided by the generalized Kadanoff-Baym ansatz are considered, in order to compare their description of relaxation processes. It is shown that the two-time quantum kinetics leads to thermalization in all the examined cases, which is not the case for the one-time approach in the intermediate-coupling regime, even though it provides convergence to a steady state. The thermalization criterion used is the Kubo-Martin-Schwinger condition.

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P. Gartner, J. Seebeck, and F. Jahnke "Quantum kinetic approach to electron-LO-phonon relaxation: Is there a phonon bottleneck problem in optoelectronic devices?", Proc. SPIE 6468, Physics and Simulation of Optoelectronic Devices XV, 646816 (7 February 2007); https://doi.org/10.1117/12.717238

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