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Proceedings Paper

Investigation of the role of free-carrier screening during relaxation of carriers excited by femtosecond optical pulses
Author(s): James E. Bair; J. Peter Krusius
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Paper Abstract

The role of free carrier screening, in the ultrafast relaxation of optically excited carriers, is reassessed using the ensemble Monte Carlo technique. The conventional static screening approximation is compared to a new dynamic screening model. Evolution of the nonequilibrium dynamic dielectric function and its consequences for the carrier scattering are examined. It is shown that dynamic screening results in significant enhancement of both the carrier-carrier and polar optic phonon scattering rates. Relaxation times for the dynamic screening model are found to be dramatically shorter than those for the static screening model. Methods of experimentally differentiating between the two models are proposed.

Paper Details

Date Published: 21 October 1992
PDF: 10 pages
Proc. SPIE 1677, Ultrafast Lasers Probe Phenomena in Semiconductors and Superconductors, (21 October 1992); doi: 10.1117/12.137692
Show Author Affiliations
James E. Bair, Cornell Univ. (United States)
J. Peter Krusius, Cornell Univ. (United States)

Published in SPIE Proceedings Vol. 1677:
Ultrafast Lasers Probe Phenomena in Semiconductors and Superconductors
Robert R. Alfano, Editor(s)

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