Probing the anisotropic dispersion of hole states in (100) and (311)A AlAs/GaAs/AlAs quantum wells
- 1 March 1994
- journal article
- Published by IOP Publishing in Semiconductor Science and Technology
- Vol. 9 (3) , 298-309
- https://doi.org/10.1088/0268-1242/9/3/010
Abstract
Magnetic fields applied parallel to the layer interfaces are used to study the in-plane energy dispersion and anisotropy of the two-dimensional hole subbands in valence band quantum wells. The quantum wells are formed in p-doped AlAs/GaAs/AlAs double-barrier resonant tunnelling diodes. Measurements on devices grown on (100)-oriented substrates reveal a complicated band structure with negative in-plane hole effective mass for some subbands and anticrossing phenomena due to light-hole-heavy-hole coupling. Measurements have been made for quantum wells with different widths. The anisotropy of the subbands is found to be small for this plane. Measurements on a device grown on a (311)A-oriented substrate reveal biaxial anisotropy in the hole subbands, some of which have a 'camel's-back'-shaped structure. The features observed experimentally are compared with envelope function calculations of the subbands of valence band quantum wells.Keywords
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