Nonlinear anomalous Hall effect and negative magnetoresistance in a system with random Rashba field

We predict two spin-dependent transport phenomena in two-dimensional electron systems, which are induced by a spatially fluctuating Rashba spin-orbit interaction. When the electron gas is magnetized, the random Rashba interaction leads to the anomalous Hall effect. An example of such a system is a n...

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Bibliographic Details
Published in:Physical review letters 2012-11, Vol.109 (20), p.206601-206601, Article 206601
Main Authors: Dugaev, V K, Inglot, M, Sherman, E Ya, Berakdar, J, Barnaś, J
Format: Article
Language:English
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Summary:We predict two spin-dependent transport phenomena in two-dimensional electron systems, which are induced by a spatially fluctuating Rashba spin-orbit interaction. When the electron gas is magnetized, the random Rashba interaction leads to the anomalous Hall effect. An example of such a system is a narrow-gap magnetic semiconductor-based symmetric quantum well. We show that the anomalous Hall conductivity reveals a strongly nonlinear dependence on the magnetization, decreasing exponentially at large spin density. We also show that electron scattering from a fluctuating Rashba field in a two-dimensional nonmagnetic electron system leads to a negative magnetoresistance arising solely due to spin-dependent effects.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.109.206601