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arXiv 2207.08045cond-mat.mes-hallcond-mat.mtrl-sci
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WTe2的轨道极化和三阶反常霍尔效应

Orbital polarization and third-order anomalous Hall effect in WTe2

Xing-Guo Ye, Peng-Fei Zhu, Wen-Zheng Xu, Zhihao Zang, Yu Ye, Zhi-Min Liao

摘要:

反常霍尔效应(AHE)已被扩展到非线性区域,其中霍尔电压对所施加的电流表现出高阶响应。然而,非线性AHE的微观机制仍不清楚。在这里,我们报告的轨道极化和其诱导的三阶AHE在几层WTe 2薄片。通过角相关电测量发现,三阶AHE与Berry连接极化率张量引起的轨道磁矩的电场诱导极化非常一致,并进一步通过极性反射磁圆二色光谱直接检测到.通过标度律分析了三阶AHE的微观机制,即电场诱导的Berry曲率驱动相反轨道的磁矩(上或下)向相反方向偏转,形成本征贡献;自旋Bloch电子的Magnus效应驱动相反轨道的磁矩向相反的横向散射,形成斜散射.

英文摘要:

The anomalous Hall effect (AHE) has been extended into the nonlinear regime, where the Hall voltage shows higher-order response to the applied current. Nevertheless, the microscopic mechanism of the nonlinear AHE remains unclear. Here we report the orbital polarization and its induced third-order AHE in few-layer WTe2 flakes. Through angle-dependent electric measurements, it is found that the third-order AHE is quite consistent with the electric field induced polarization of orbital magnetic moment caused by the Berry connection polarizability tensor, which is further directly detected by polar reflective magnetic circular dichroism spectroscopy. The microscopic mechanisms of third-order AHE are analyzed through the scaling law, that is, the opposite orbital magnetic moments (up or down) deflect to opposite directions driven by electric field induced Berry curvature, forming the intrinsic contribution; driven by the Magnus effect of the self-rotating Bloch electrons, the opposite orbital magnetic moments are scattered towards opposite transverse directions, resulting in the skew scattering.

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