Van Hove Type M1 Exciton and Stark Localization Exciton in GaAs-AlGaAs Superlattices under an Electric Field

Abstract

A field-dependent two-dimensional exciton due to a Van Hove type M1 singularity at the top of superlattice minibands has been observed in MBE grown superlattices for the first time at room temperature. The largest ever-reported room temperature two-dimensional heavy hole exciton shift up to ~30meV was observed by field-dependent photocurrent measurements.