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arXiv 2205.06293cond-mat.mes-hallhep-th
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Weyl材料对赝电场的电响应和手征响应

Electric and chiral response to a pseudoelectric field in Weyl materials

A. A. Herasymchuk, P. O. Sukhachov, E. V. Gorbar

摘要:

研究了Weyl半金属中电场和手征电流对时间和坐标相关的赝电场$\mathbf{E}_5$的响应。发现$\mathbf{E}_5$导致一个电流的方向垂直于场和场诱导扰动的波矢。我们称这种现象为反常伪霍尔效应。的手征或谷电流的赝电场的响应也被发现是不平凡的。由于$\mathbf{E}_5$的波矢不能忽略,手性电导率的频率分布与其电对应物显著不同,显示阶梯状特征而不是平滑的Drude峰。提出的效果可以通过驱动声波在Weyl半金属与破缺的时间反演对称性。

英文摘要:

The electric and chiral current response to the time- and coordinate-dependent pseudoelectric field $\mathbf{E}_5$ in Weyl semimetals is studied. It is found that $\mathbf{E}_5$ leads to an electric current in the direction perpendicular to the field and the wave vector of the field-inducing perturbation. We dubbed this phenomenon the anomalous pseudo-Hall effect. The response of the chiral or valley current to the pseudoelectric field is also found to be nontrivial. Since the wave vector for $\mathbf{E}_5$ cannot be neglected, the frequency profile of the chiral conductivity is drastically different from its electric counterpart showing a step-like feature instead of a smooth Drude peak. The proposed effects can be investigated by driving sound waves in Weyl semimetals with broken time-reversal symmetry.

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