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arXiv 2407.20752cond-mat.mes-hall
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内禀二阶自旋流

Intrinsic Second Order Spin Current

Zhi-Fan Zhang, Zhen-Gang Zhu, Gang Su

AI总结:

本文基于含时微扰理论预言由自旋相关Berry曲率极化率诱导的内禀二阶自旋流,并以二维Rashba-Dresselhaus体系揭示其随化学势的主导区域及实验区分途径。

摘要:

近年来,非线性霍尔效应受到广泛关注,其包含由Drude效应、Berry曲率偶极矩和Berry联络极化率贡献的三个不同项。在本工作中,我们基于含时微扰理论,从理论上预言了一种由自旋相关Berry曲率极化率诱导的内禀二阶自旋流。我们展示了由群速度和自旋相关Berry曲率偶极矩贡献的另外两种二阶自旋电导率。以二维Rashba-Dresselhaus自旋轨道耦合体系为例进行研究,发现内禀二阶贡献在μ>0区域起主要作用,而当μ<0时电流主要来自外禀项。因此,自旋电导率对化学势的依赖有望在实验上区分外禀和内禀贡献。

英文摘要:

In recent years, nonlinear Hall effect has attracted great attention with three different terms contributed by Drude effect, Berry curvature dipole and Berry connection polarizability. In this work, we theoretically predict an intrinsic second order spin current induced by spin-dependent Berry curvature polarizability based on time-independent perturbation theory. We show other two second order spin conductivities contributed by the group velocity and spin-dependent Berry curvature dipole.A two-dimensional Rashba-Dresselhaus spin-orbit coupled system is studied as an example, and it is found that the intrinsic second order contribution plays a major role in the region of $μ>0$, while current mainly comes from the extrinsic terms when $μ<0$. Thus, the dependence of spin conductivity on chemical potential is expected to distinguish the extrinsic and intrinsic contributions experimentally.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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