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Phys Rev Lett. 2009 Jul 24;103(4):047203. Epub 2009 Jul 23.

Hall effect of spin waves in frustrated magnets.

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Department of Physics, Kyoto University, Kyoto 606-8502, Japan.


We examine a possible spin Hall effect for localized spin systems with no charge degrees of freedom. In this scenario, a longitudinal magnetic field gradient induces a transverse spin current carried by spin wave excitations with an anomalous velocity which is caused by a topological Berry-phase effect associated with spin chirality, in analogy with anomalous Hall effects in itinerant electron systems. Our argument is based on semiclassical equations of motion applicable to general spin systems. Also, a microscopic model of frustrated magnets which exhibits the anomalous spin Hall effect is presented.

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