21 October 1992 Investigation of the role of free-carrier screening during relaxation of carriers excited by femtosecond optical pulses
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Proceedings Volume 1677, Ultrafast Lasers Probe Phenomena in Semiconductors and Superconductors; (1992); doi: 10.1117/12.137692
Event: Semiconductors '92, 1992, Somerset, NJ, United States
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.
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James E. Bair, J. Peter Krusius, "Investigation of the role of free-carrier screening during relaxation of carriers excited by femtosecond optical pulses", Proc. SPIE 1677, Ultrafast Lasers Probe Phenomena in Semiconductors and Superconductors, (21 October 1992); doi: 10.1117/12.137692; https://doi.org/10.1117/12.137692
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KEYWORDS
Scattering

Phonons

Dielectrics

Electrons

Photons

Monte Carlo methods

Femtosecond phenomena

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