Spin current and accumulation generated by spin Hall insulator

Details Spin current and accumulation generated by spin Hall insulator Spin current and accumulation generated by spin Hall insulator

2005-05-18

arxiv.org/abs/cond-mat/0505436v1

Phys. Rev. Lett. 95, 106601 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 5 figures, REVTeX

Scientific paper

10.1103/PhysRevLett.95.106601

Spin current and accumulation generated by the electric field in spin Hall insulator (SHI) are investigated theoretically in terms of the Keldysh formalism. In contrast to the quantum Hall system, there are no massless edge modes in general. The spin current is generated near the contacts to the electrodes by the hybridization between the metallic states and the conduction/valence bands of the SHI, but is truncated by the sink and source of the spin. However, one can produce the spin current flowing out to the conductors, which is attached to the SHI, and also the spin accumulation there due to the leakage charge current which breaks the time-reversal symmetry.

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