High magnetic field studies of the confined hole states in quantum wells grown on novel substrate orientations: Evidence for a ‘camel's back’ structure in the energy subbands

Abstract

Magnetic fields are used to examine the anisotropic in-plane energy dispersion of the quantum well states of an AlAs/GaAs/AlAs double-barrier diode grown on a (3 1 1)A substrate. The measurements reveal biaxial anisotropy in some subbands. These features are confirmed by a six-component envelope-function calculation of the subbands of a (3 1 1) valence band quantum well.