High-magnetic-field studies of hole energy dispersion, cubic anisotropy and space charge build-up in the quantum well of p-type resonant tunnelling devices

Abstract

Magnetic fields up to 41 T (B perpendicular to J) are used to investigate hole tunnelling in p-type double-barrier AlAs/GaAs structures and to probe the dispersion curves of the hole states of the quantum well. The high magnetic fields reveal the cubic anisotropy of these states. A detailed comparison is made between the experimental data and the theoretical hole dispersion curves. Hole space charge build-up is observed in the quantum well and is measured using the Landau quantization effect for B//J.