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Build‐up and decoherence of optical transients in disordered semiconductors
Author(s) -
Velický B.,
Kalvová A.
Publication year - 1995
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221880149
Subject(s) - quasiparticle , ansatz , quantum decoherence , semigroup , propagator , factorization , semiconductor , physics , function (biology) , distribution function , quantum mechanics , distribution (mathematics) , statistical physics , quantum electrodynamics , quantum , mathematics , mathematical analysis , superconductivity , algorithm , evolutionary biology , biology
Abstract For a model two‐band semiconductor with static disorder, suddenly illuminated by intense light, the averaged non‐equilibrium Green function can be obtained within the coherent potential approximation. Explicit solutions found previously are analyzed on numerical examples of the transient photoexcited distribution. The results are used to test the semigroup property of the propagators and the analogous factorization of the particle correlation function known as the generalized Kadanoff‐Baym ansatz. Both properties hold much better if quasiparticle states are used instead of the bare particles. The quasiparticle modification of the ansatz is motivated formally and verified on numerical data.