Stark localization in GaAsGaAlAs superlattices under a low electric field

Abstract

We show, from the photoluminescence of a GaAsGa 0.65Al 0.35As superlattice of period 70 Å, that the localization of the electrons takes place at low field (≈ 1 × 10 4 V cm −1). Before the localization, the energy of the photoluminescence line does not vary appreciably with the electric field. When the localization begins, the binding energy of the heavy-hole exciton is approximately the same whether the electron wave-function is centered on the same well as the hole or an adjacent well.