Spin Hall Insulator

Abstract

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.

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

References in corpus (3)

• Dissipationless Quantum Spin Current at Room Temperature
• SU(2) Non-Abelian Holonomy and Dissipationless Spin Current in Semiconductors
• Absence of vertex correction for the spin Hall effect in p-type semiconductors

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