Nonlinear Anomalous Hall Effect and Negative Magnetoresistance in a System with Random Rashba Field

作者：Dugaev V K^*; Inglot M; Sherman E Ya; Berakdar J; Barnas J

来源：Physical Review Letters, 2012, 109(20): 206601.

DOI：10.1103/PhysRevLett.109.206601

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.

• 出版日期2012-11-12