Periodic negative conductance by sequential resonant tunneling through an expanding high-field superlattice domain

Abstract

Strikingly periodic negative-differential-resistance oscillations are observed in doped GaAs/${\mathrm{Al}}_{\mathrm{x}}$${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$As superlattices. These are produced by well-to-well sequential resonant tunneling through weakly coupled localized states.