Abstract

The Weyl semimetal, due to a non-zero energy difference in the pair of Weyl nodes, shows chiral magnetic effect (CME). This leads to a flow of dissipationless electric current along an applied magnetic field. Such a chiral magnetic effect in Weyl semimetals has been studied using the laws of classical electrodynamics. It has been shown that the CME in such a semimetal changes the properties namely, frequency-dependent skin depth, capacitive transport, plasma frequency, etc., in an unconventional way as compared to the conventional metals. In the low-frequency regime, the properties are controlled by a natural length scale due to CME called the chiral magnetic length. Furthermore, unlike the conventional metals, the plasma frequency in this case is shown to be strongly magnetic field-dependent. Since the plasma frequency lies below the optical frequency, the Weyl semimetals will look transparent. Such new and novel observations might help in exploiting these class of materials in potential applications which would completely change the future technology.

Graphic abstract

中文翻译：

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Weyl半金属中的手性磁效应和Maxwell–Chern–Simons电动力学

摘要

由于一对Weyl节点中的能量差不为零，因此Weyl半金属显示出手性磁效应（CME）。这导致沿着施加的磁场的无耗散电流的流动。使用经典电动力学定律研究了魏尔半金属中的这种手性磁效应。已经表明，与常规金属相比，在这种半金属中的CME以非常规的方式改变了性质，即随频率变化的趋肤深度，电容传输，等离子体频率等。在低频状态下，由于CME（称为手性磁长度）的影响，性能由自然长度标度控制。此外，与常规金属不同，在这种情况下，等离子体频率显示为强磁场依赖性。由于等离子频率低于光学频率，因此Weyl半金属看起来是透明的。这些新奇而新颖的发现可能有助于在潜在应用中开发此类材料，这将彻底改变未来的技术。

图形摘要