Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2005-10-20
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
7 pages, 8 figures, accepted for publication in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.73.115307
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.
Gartner Paul
Jahnke Frank
Seebeck Jan
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