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Relaxation properties of the quantum kinetics of carrier-LO-phonon interaction in quantum wells and quantum dots

Paul Gartner·Jan Seebeck·Frank Jahnke
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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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Paul Gartner, Jan Seebeck, Frank Jahnke. 2006-02-17. Relaxation properties of the quantum kinetics of carrier-LO-phonon interaction in quantum wells and quantum dots. https://doi.org/10.1103/physrevb.73.115307

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