Department of Physics, Rzeszów University of Technology, al. Powstańców Warszawy 6, 35-959 Rzeszów, Poland.
Phys Rev Lett. 2012 Nov 16;109(20):206601. doi: 10.1103/PhysRevLett.109.206601. Epub 2012 Nov 12.
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.
我们预测了二维电子系统中两种由空间随机 Rashba 自旋轨道相互作用引起的自旋相关输运现象。当电子气被磁化时，随机 Rashba 相互作用导致反常 Hall 效应。这种系统的一个例子是基于窄隙磁性半导体的对称量子阱。我们表明反常 Hall 电导率对磁化强度具有强烈的非线性依赖性，在高自旋密度下呈指数衰减。我们还表明，二维非磁性电子系统中 Rashba 场的随机散射会导致负磁阻，这完全是由于自旋相关效应引起的。
