Density matrix methods for semiconductor coulomb dynamics

James W. Dufty, Chang Sub Kim, Michael Bonitz, Rolf Binder

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Current experiments on semiconductor devices using femtosecond lasers provide new theoretical challenges for the description of charge carrier dynamics. Among the new features of such experiments are states driven very far from equilibrium and probes on time scales short compared to scattering and other characteristic material relaxation times. Standard many-body methods must be modified and extended to accommodate these features. We propose that the quantum hierarchy for reduced density operators is an ideal formulation of such initial value problems and describe how the dominant effects of exchange and charge correlations can be accounted for in a simple and physically transparent closure of the hierarchy of equations. The transformations, approximations, and interpretation can be accomplished independent of any particular matrix representation. Decomposition into kinetic equations for band occupation densities and polarization densities follows in a straightforward way after the many-body problem has been brought under control.

Original languageEnglish (US)
Pages (from-to)929-940
Number of pages12
JournalInternational Journal of Quantum Chemistry
Volume65
Issue number5
DOIs
StatePublished - Jan 1 1997

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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