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Coherent and non-Markovian effects in ultrafast relaxation of photoexcited hot carriers: A model study

Coherent and non-Markovian effects in ultrafast relaxation of photoexcited hot carriers: A model... We discuss two quantum effects that can influence the relaxation of carriers in a semiconductor excited by an ultrashort light pulse. Namely, the presence of nonzero interband optical polarization and the large energy uncertainty of carriers created by the short exciting pulse. The importance of both effects is investigated numerically for the case of electron–LO-phonon interaction assuming a model (exponential) pulse shape. Comparison of the results with the predictions based on the conventional Boltzmann equation indicates that both effects lead to a much more even distribution of carriers over k space, which may significantly shorten thermalization times. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Coherent and non-Markovian effects in ultrafast relaxation of photoexcited hot carriers: A model study

Physical Review B , Volume 44 (24) – Dec 15, 1991
12 pages

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Publisher
American Physical Society (APS)
Copyright
Copyright © 1991 The American Physical Society
ISSN
1095-3795
DOI
10.1103/PhysRevB.44.13381
Publisher site
See Article on Publisher Site

Abstract

We discuss two quantum effects that can influence the relaxation of carriers in a semiconductor excited by an ultrashort light pulse. Namely, the presence of nonzero interband optical polarization and the large energy uncertainty of carriers created by the short exciting pulse. The importance of both effects is investigated numerically for the case of electron–LO-phonon interaction assuming a model (exponential) pulse shape. Comparison of the results with the predictions based on the conventional Boltzmann equation indicates that both effects lead to a much more even distribution of carriers over k space, which may significantly shorten thermalization times.

Journal

Physical Review BAmerican Physical Society (APS)

Published: Dec 15, 1991

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