Generalized drift-diffusion model for miniband superlattices

[摘要] A drift-diffusion model of miniband transport in strongly coupled superlattices is derived from the single-miniband Boltzmann-Poisson transport equation with a Bhatnagar-Gross-Krook collision term. We use a consistent Chapman-Enskog method to analyze the hyperbolic limit, at which collision and electric-field terms dominate the other terms in the Boltzmann equation. The reduced equation is of the drift-diffusion type, but it includes additional terms, and diffusion and drift do not obey the Einstein relation except in the limit of high temperatures.

[发布日期] 2003-12-01

[关键词] TRANSPORT;CONDUCTIVITY;PROPAGATION;INSTABILITY