Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-06-03
Appl. Phys. Lett. 89, 112102 (2006) (3 pages).
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Accepted for publication in Applied Physics Letters, an enlarged version, 5 pages, 4 figs
Scientific paper
10.1063/1.2345024
The intrinsic spin Hall conductance shows rich sign changes by applying a perpendicular magnetic field in a two-dimensional hole gas. Especially, a notable sign changes can be achieved by adjusting the characteristic length of the Rashba coupling and hole density at moderate magnetic fields. This sign issue may be easily realized in experiments. The oscillations of the intrinsic spin Hall conductance as a function of 1/$B$ is nothing else but Shubnikov-de Haas oscillations, and the additional beatings can be quantitatively related to the value of the spin-orbit coupling parameter. The Zeeman splitting is too small to introduce effective degeneracy between different Landau levels in a two-dimensional hole gas, and the resonant intrinsic spin Hall conductance appears in high hole density and strong magnetic field due to the transition between mostly spin-$-{1/2}$ holes and spin-3/2 holes is confirmed. Two likely ways to establish intrinsic spin Hall effect in experiments and a possible application are suggested.
Liu Qin
Ma Tianxing
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