Many-body semiclassical approximation for semiconductor plasmas

A. M. Kriman, R. P. Joshi, D. K. Ferry

Research output: Contribution to journalConference article

1 Scopus citations

Abstract

Realistic simulations of semiconductor plasmas require detailed, many-species descriptions of the phonon and electronic systems. Limited numerical power then usually requires simplifying approximations. One approximation is the use of a screened Coulomb interaction. When an accurate screening function is not available, or when a better electrostatics treatment is needed, one can perform ensemble Monte Carlo (EMC) simulations that use a phase-space-Trajectories or "molecular dynamics" (MD) evolution of the electron ensemble. In these EMCIMD simulations, Coulomb scattering events are treated continuously in the MD evolution of electron trajectories rather than by instantaneous scattering in EMC. Dynamic screening effects are then included accurately by the explicit correlated motion of the electron ensemble. The electron trajectories simulated by MD have until recently been completely classical. We describe extensions of EMCTMD into the semiclassical regime, thus incorporating quantum effects such as position-momentum uncertainty. The method takes account of the Fermi statistics of the many-electron ensemble, yielding spin-dependent exchange contributions to the forces and effective mass. We describe effects of these corrections on the velocity autocorrelation function and on thermalization of satellite-valley electrons.

Original languageEnglish
Pages (from-to)2-8
Number of pages7
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume1677
DOIs
StatePublished - 1992
EventUltrafast Lasers Probe Phenomena in Semiconductors and Superconductors 1992 - Somerset, United States
Duration: Mar 22 1992 → …

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