Intrinsic interface states in InAs–AlSb heterostructures

Abstract : We examine the formation of intrinsic interface states bound to the plane of In–Sb chemical bonds at InAs–AlSb interfaces. Careful parameterization of the bulk materials in the frame of the extended-basis spds * tight-binding model and recent progress in predictions of band offsets severely limit the span of tight-binding parameters describing this system. We find that a heavy-hole-like interface state bound to the plane of In–Sb bonds exists for a large range of values of the InSb–InAs band offset