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arXiv 2201.07991cond-mat.mes-hallcond-mat.str-elhep-phnucl-thquant-ph
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非相对论体系中的手征反常:Berry曲率与手征动力学理论

Chiral anomaly in non-relativistic systems: Berry curvature and chiral kinetic theory

Lan-Lan Gao, Xu-Guang Huang

摘要:

手征反常及其引起的量子新现象在狄拉克和外尔费米子中得到了广泛的研究。在大多数典型的情况下,假设洛伦兹协方差,从而保持线性色散关系。然而,在现实的材料,如狄拉克和外尔半金属,非线性色散关系自然出现。利用Wigner函数和半经典运动方程的方法,建立了一个动力学框架来研究具有非线性色散的Weyl费米子的手征反常。在这个框架中,手征异常来源于动量空间中的Berry单极子,并且可以由于Berry单极子周围的绕组而被增强或抑制。我们的结果有助于理解非相对论系统中手征反常诱导的输运现象。

英文摘要:

Chiral anomaly and the novel quantum phenomena it induces have been widely studied for Dirac and Weyl fermions. In most typical cases, the Lorentz covariance is assumed and thus the linear dispersion relations are maintained. However, in realistic materials, such as Dirac and Weyl semimetals, the non-linear dispersion relations appear naturally. We develop a kinetic framework to study the chiral anomaly for Weyl fermions with non-linear dispersions by using the methods of Wigner function and semi-classical equations of motion. In this framework, the chiral anomaly is sourced by Berry monopoles in momentum space and could be enhanced or suppressed due to the windings around the Berry monopoles. Our results can help understand the chiral anomaly-induced transport phenomena in non-relativistic systems.

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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