HIGH-MAGNETIC-FIELD STUDIES OF HOLE ENERGY DISPERSION, CUBIC ANISOTROPY AND SPACE-CHARGE BUILDUP IN THE QUANTUM-WELL OF P-TYPE RESONANT TUNNELING DEVICES

Magnetic fields up to 41 T (B perpendicular-to J) are used to investig ate 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 t heoretical hole dispersion curves. Hole space charge build-up is obser ved in the quantum well and is measured using the Landau quantization effect for B parallel-to J.