Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-12-04
Phys. Rev. B 79, 155323 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
16 pages, 12 figures, RevTex
Scientific paper
10.1103/PhysRevB.79.155323
We present a detailed theoretical study of the electronic spectrum and Zeeman splitting in hole quantum wires. The spin-3/2 character of the topmost bulk-valence-band states results in a strong variation of subband-edge g factors between different subbands. We elucidate the interplay between quantum confinement and heavy-hole - light-hole mixing and identify a certain robustness displayed by low-lying hole-wire subband edges with respect to changes in the shape or strength of the wire potential. The ability to address individual subband edges in, e.g., transport or optical experiments enables the study of holes states with nonstandard spin polarization, which do not exist in spin-1/2 systems. Changing the aspect ratio of hole wires with rectangular cross-section turns out to strongly affect the g factor of subband edges, providing an opportunity for versatile in-situ tuning of hole-spin properties with possible application in spintronics. The relative importance of cubic crystal symmetry is discussed, as well as the spin splitting away from zone-center subband edges.
Brusheim P.
Csontos Dan
Xu Hongqi Q.
Zuelicke Ulrich
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