Comment on ’’Simulation of high‐field transport in GaAs using a Monte Carlo method and pseudopotential band structures’’ and on ’’Band‐structure dependent transport and impact ionization in GaAs’’
作者:
F. Capasso,
T. P. Pearsall,
K. K. Thornber,
R. E. Nahory,
M. A. Pollack,
G. B. Bachelet,
J. R. Chelikowsky,
期刊:
Journal of Applied Physics
(AIP Available online 1982)
卷期:
Volume 53,
issue 4
页码: 3324-3326
ISSN:0021-8979
年代: 1982
DOI:10.1063/1.330993
出版商: AIP
数据来源: AIP
摘要:
Recent theoretical work by Shichijo, Hess, and Stillman on a Monte Carlo simulation of high‐field transport and impact ionization in GaAs is examined. The failure of that calculation to reproduce the experimentally well‐documented orientation dependence of impact ionization can be directly related to the use of a phonon scattering rate that is unrealistically high. It is shown that such high scattering rates lead, by the uncertainty principle to a large collisional broadening (?0.3 to 0.6 eV) of the conduction band, thus invalidating the Monte Carlo simulation and rendering questionable any attempt to relate transport to the band structure. The important role played by the avalanche region width in the orientation dependence of impact ionization is also discussed.
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