论文标题
磁场中的磁场异常的磁光kerr效应和磁场中的手性异常的特征
Magneto-optical Kerr effect and signature of the chiral anomaly in a Weyl semimetal in a magnetic field
论文作者
论文摘要
Weyl半准（WSM）的Landau级谱的一个惊人特性是手性Landau水平的存在，其中电子沿着磁场单向传播。该线性分散水平会影响WSM的光学特性。例如，最近表明，在放置在磁场\ cite％{Bertrand2019}中的时间反转对称的Weyl半学中，可以实现完整的光谷极化。该作用源自涉及手性Landau水平的Landau水平过渡，需要对Weyl锥的倾斜。在本文中，我们展示了如何在WSM \中与倾斜的Weyl锥相比在正常金属中的行为以及如何使用Moke检测到山谷极化的磁光kerr效应（moke）。我们研究了在没有费米弧的半无限WSM表面上的光入射的Faraday（纵向）和VOIGT（横向）配置。我们使用WSM的最小模型，该模型具有四个通过镜像和时间反转对称性相关的倾斜的Weyl节点。在VOIGT配置中，在等离子体频率处发生了Kerr角的大峰。我们表明，随着磁场的增加，该峰的频率频率是摩克手性异常的标志。
One striking property of the Landau level spectrum of a Weyl semimetal (WSM) is the existence of a chiral Landau level, in which the electrons propagate unidirectionally along the magnetic field. This linearly dispersive level influences the optical properties of WSMs. For example, it was recently shown that a complete optical valley polarization is achievable in a time-reversal symmetric Weyl semimetal placed in a magnetic field\cite% {Bertrand2019}. This effect originates from inter-Landau level transitions involving the chiral Landau level and requires a tilt of the Weyl cones. In this paper, we show how the magneto-optical Kerr effect (MOKE) is modified in a WSM\ with tilted Weyl cones in comparison with its behavior in a normal metal and how a valley polarization can be detected using MOKE. We study both the Faraday (longitudinal) and Voigt (transverse) configurations for light incident on a semi-infinite WSM surface with no Fermi arcs. We use a minimal model of a WSM with four tilted Weyl nodes related by mirror and time-reversal symmetry. In the Voigt configuration, a large peak of the Kerr angle occurs at the plasmon frequency. We show that the blueshift in frequency of this peak with increasing magnetic field is a signature of the chiral anomaly in the MOKE.
