Spin-Hall effect in two-dimensional mesoscopic hole systems

Abstract

The spin Hall effect in two dimensional hole systems is studied by using the four-terminal Landauer-Büttiker formula with the help of Green functions. The spin Hall effect exists even when there are {\em not} any correlations between the spin-up and -down heavy holes (light holes) and when the $\Gamma$-point degeneracy of the heavy hole and light hole bands is lifted by the confinement or recovered by the strain. When only a heavy hole charge current without any spin polarization is injected through one lead, under right choice of lead voltages, one can get a pure heavy (light) hole spin current, combined with a possible impure light (heavy) hole spin current from another two leads. The spin Hall coefficients of both heavy and light holes depend on the Fermi energy, devise size and the disorder strength. It is also shown that the spin Hall effect of two dimensional hole systems is much more robust than that of electron systems with the Rashba spin-orbit coupling and the spin Hall coefficients do not decrease with the system size but tend to some nonzero values when the disorder strength is smaller than some critical value.

5 pages, 4 figures

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• Persistent spin current in nano-devices and definition of the spin current
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• Dependence of the intrinsic spin Hall effect on spin-orbit interaction character
• Strongly modulated transmission of a spin-split quantum wire with local Rashba interaction
• Remote-control spin filtering through a $T$-type structure
• Hall Voltage with the Spin Hall Effect
• Electrical and thermoelectric transport properties of two-dimensional fermionic systems with $k$-cubic spin-orbit coupling
• Magnetotransport properties of two-dimensional fermions with $k$-cubic Rashba spin-orbit interaction
• Oscillation of spin polarization in a two-dimensional hole gas under a perpendicular magnetic field
• Spin Seebeck Effect in Asymmetric Four-Terminal Systems with Rashba Spin-Orbit Coupling