A theory of nonequilibrium carrier transport in multivalley semiconductors

Autor:	E. E. Kunhardt, M. Cheng
Rok vydání:	1990
Předmět:	Chemistry Phase space Electric field Monte Carlo method General Physics and Astronomy Non-equilibrium thermodynamics Semiclassical physics Charge carrier Electron Statistical physics Boltzmann equation
Zdroj:	Journal of Applied Physics. 67:1907-1914
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.345620
Popis:	The concept of a macrokinetic distribution (MKD) is used to develop a theory of nonequilibrium carrier transport in multivalley semiconductors. The MKD is a momentum‐dependent function with macroscopic space‐time scales, whose equation of evolution is macroscopically equivalent to the semiclassical Boltzmann transport equation for the phase‐space distribution. A MKD is obtained for each valley and used to close the set of coupled moment equations that describe carrier transport in each valley. The resulting set of equations constitutes the model. A two‐valley model is developed to illustrate the theoretical procedure. Results are obtained for the response of electrons to a rapidly varying (in time) electric field. These results are compared to those obtained using Monte Carlo (MC) methods and also an equivalent single‐valley model. Excellent agreement is obtained between the macrokinetic model and the MC results. The single‐valley model is shown to be inadequate in situations where intervalley carrier tra...
Databáze:	OpenAIRE
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