Theory of Anomalous Transport
Abstract
One consequence of spin-orbit interactions in a crystal is that they lead to a change in the group-velocity of Bloch electrons, an anomalous velocity, that is linear in electric field. The anomalous velocity is proportional to the Berry curvature of Bloch electrons in momentum space and can contribute to various linear transport coefficients, notably to the so-called anomalous Hall effect that occurs in ferromagnetic metals and, in paramagnetic metals, to the spin Hall effect. In this talk, I will discuss the anomalous velocity contribution to the Hall effect in ferromagnetic transition metals, ferromagnetic semiconductors, and paramagnetic diluted-magnetic-semiconductor two-dimensional electron gas systems. I will address the interplay between the anomalous velocity Hall currents, which are intrinsic, and extrinsic contributions that are dependent on the random disorder in a particular sample.
- Publication:
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APS March Meeting Abstracts
- Pub Date:
- March 2004
- Bibcode:
- 2004APS..MAR.P2004M