Small Signal Differential Mobility of Planar Superlattice Miniband Transport and Negative Differential Conductance
We study the phenomenon of negative differential conductance (NDC) in Bloch miniband superlattices originally predicted by (1970). For device purposes, it is important to characterize transport in a small-signal ac electric field superposed on a dc bias field. We report here the results of a theoretical study carried out for a GaAs-based planar superlattice. Employing a microscopic balance equation formulation, we include all dissipative-scattering mechanisms and relatively strong electron-electron interactions (Lei et al., 1991, 1992, 1993a, 1993b; Lei, 1992a, 1992b). Relaxation-time approximations are not used.
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