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arXiv 2203.04281cond-mat.mes-hall
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周期性驱动下Weyl和多Weyl半金属的磁输运特征

Magneto-transport signatures in periodically-driven Weyl and multi-Weyl semimetals

Shivam Yadav, Serena Fazzini, Ipsita Mandal

AI总结:

本研究通过周期性驱动探讨Weyl和多Weyl半金属的磁输运特性,利用Floquet方法分析输运系数并验证拓扑性质的实验观测。

摘要:

我们研究了时间周期性驱动(例如,通过照射圆偏振光)对三维Weyl和多Weyl半金属的影响,在平面霍尔和平面热霍尔装置中。我们通过Floquet方法在高频极限下纳入驱动的影响。我们使用半经典玻尔兹曼输运方程评估纵向磁导电率、平面霍尔导电率、纵向热电系数和横向热电系数。我们通过在某些参数极限下显式表达这些输运系数,其中可以解析地进行积分。我们通过将物理值与直接从积分数值积分获得的数值结果进行比较,交叉验证我们的解析近似。所得结果表明,相应半金属的拓扑电荷在这些输运性质中具有深远的特征,可以在实验中观察到。

英文摘要:

We investigate the influence of a time-periodic driving (for example, by shining circularly polarized light) on three-dimensional Weyl and multi-Weyl semimetals, in the planar Hall and planar thermal Hall set-ups. We incorporate the effects of the drive by using the Floquet formalism in the large frequency limit. We evaluate the longitudinal magneto conductivity, planar Hall conductivity, longitudinal thermo-electric coefficient, and transverse thermo-electric coefficient, using the semi-classical Boltzmann transport equations. We demonstrate the explicit expressions of these transport coefficients in certain limits of the parameters, where it is possible to perform the integrals analytically. We cross-check our analytical approximations by comparing the physical values with the numerical results, obtained directly from the numerical integration of the integrals. The answers obtained show that the topological charges of the corresponding semimetals have profound signatures in these transport properties, which can be observed in experiments.

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