Spin Hall Insulator

Details Spin Hall Insulator Spin Hall Insulator

2004-05-31

arxiv.org/abs/cond-mat/0406001v2

Phys. Rev. Lett. 93, 156804 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures, modified Introduction, accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.93.156804

Recent theories predict dissipationless spin current induced by an electric field in doped semiconductors. Nevertheless, the charge current is still dissipative in these systems. In this work, we theoretically predict the dissipationless spin Hall effect, without any accompanying charge current, in some classes of band insulators, including zero-gap semiconductors such as HgTe and narrow-gap semiconductors such as PbTe. This effect is similar to the quantum Hall effect in that all the states below the gap contribute and there occurs no dissipation. However the spin Hall conductance is not quantized even in two dimensions. This is the first example of a nontrivial topological structure in a band insulator without any magnetic field.

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