Hot electrons in superlattices: quantum transport versus Boltzmann equation

摘要

A self-consistent solution of the transport equation is presented for semiconductor superlattices within different approaches: (i) a full quantum transport model based on nonequilibrium Green functions, (ii) the semi classical Boltzmann equation for electrons in a miniband, and (iii) Boltzmann equation for electrons in Wannier-Stark states. We find good quantitative agreement of the approximations (ii) and (iii) with (i) in their respective ranges of validity.