Topological spin-Hall current in waveguided zinc-blende semiconductors with Dresselhaus spin-orbit coupling
arXiv:0709.0609 · doi:10.1016/j.aop.2009.08.007
Abstract
We describe an intrinsic spin-Hall effect in -type bulk zinc-blende semiconductors with topological origin. When electron transport is confined to a waveguide structure, and the applied electric field is such that the spins of electrons remain as eigenstates of the Dresselhaus spin-orbit field with negligible subband mixing, a gauge structure appears in the momentum space of the system. In particular, the momentum space exhibits a non-trivial Berry curvature which affects the transverse motion of electrons anisotropically in spin, thereby producing a finite spin-Hall effect. The effect should be detectable using standard techniques in the literature such as Kerr rotation, and be readily distinguishable from other mechanisms of the spin-Hall effect.
6 pages, 3 figures
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