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

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.

arXiv comment7 pages, 8 figures, accepted for publication in Phys. Rev. B

References in corpus (4)

• Polarons in semiconductor quantum-dots and their role in the quantum kinetics of carrier relaxation
• Influence of carrier-carrier and carrier-phonon correlations on optical absorption and gain in quantum-dot systems
• Excitation Induced Dephasing in Semiconductor Quantum Dots
• Correlations in Many-Body Systems with Two-time Green's Functions

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