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arXiv 2407.00516cond-mat.mes-hall
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标量势梯度引起的轨道Edelstein效应

Orbital Edelstein effect from the gradient of a scalar potential

I. A. Ado, M. Titov, Rembert A. Duine, Arne Brataas

AI总结:

研究不对称标量势引起的轨道Edelstein效应,通过Kubo公式和定性推导发现该效应不依赖自旋轨道耦合且与动量弛豫时间三次方成正比,在弱SOC的干净大系统中可远超自旋Edelstein效应。

摘要:

我们研究源于特定反演对称性破缺机制的轨道Edelstein效应(OEE):不对称标量势。在扩散区域内,借助Kubo公式针对抛物型能带哈密顿量计算了此类OEE。我们还给出了该效应的定性推导。两种方法给出相同结果。该结果不依赖自旋轨道耦合(SOC),且与动量弛豫时间的三次方成正比。在弱SOC的足够干净的大型系统中,这种性质的OEE应比自旋Edelstein效应大几个数量级。它也可能为一些关于自旋霍尔效应的实验提供另一种解释。

英文摘要:

We study the orbital Edelstein effect (OEE) that originates from a particular inversion symmetry breaking mechanism: an asymmetric scalar potential. We compute OEE of this kind with the help of the Kubo formula in the diffusive regime for a parabolic band Hamiltonian. We also present a qualitative derivation of the effect. Both approaches give the same result. This result does not rely on spin-orbit coupling (SOC) and scales as a cube of the momentum relaxation time. In sufficiently clean large systems with weak SOC, OEE of this nature should exceed the spin Edelstein effect by orders of magnitude. It may also provide an alternative interpretation for some experiments concerning the spin Hall effect.

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