Spin magnetotransport in two-dimensional hole systems

Abstract

Spin current of two-dimensional holes occupying the ground-state subband in an asymmetric quantum well and interacting with static disorder potential is calculated in the presence of a weak magnetic field H perpendicular to the well plane. Both spin-orbit coupling and Zeeman coupling are taken into account. It is shown that the applied electric field excites both the transverse (spin-Hall) and diagonal spin currents, the latter changes its sign at a finite H and becomes greater than the spin-Hall current as H increases. The effective spin-Hall conductivity introduced to describe the spin response in Hall bars is considerably enhanced by the magnetic field in the case of weak disorder and demonstrates a non-monotonic dependence on H.

4 pages, 2 figures, published in Phys. Rev. B

References in corpus (3)

• Spin current and polarization in impure 2D electron systems with spin-orbit coupling
• Spin-Hall transport of heavy holes in III-V semiconductor quantum wells
• Small-angle impurity scattering and the spin Hall conductivity in 2D systems