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arXiv 2008.04977cond-mat.mes-hallcond-mat.other
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磁场中Weyl半金属的磁光Kerr效应和手征异常特征

Magneto-optical Kerr effect and signature of the chiral anomaly in a Weyl semimetal in a magnetic field

Jean-Michel Parent, René Côté, Ion Garate

摘要:

外尔半金属(WSM)的朗道能级谱的一个显著特性是存在手征朗道能级,其中电子沿磁场单向传播。该线性色散水平影响WSM的光学性质。例如,最近表明,在置于磁场\cite %中的时间反演对称Weyl半金属中可实现完全的光学谷偏振{Bertrand 2019}。这种效应起源于涉及手征朗道能级的朗道能级间跃迁,并且需要外尔锥的倾斜。在本文中,我们展示了磁光克尔效应(MOKE)是如何修改的WSM\与倾斜的外尔锥在其行为相比,在正常的金属和如何谷偏振可以检测使用MOKE。我们研究了法拉第(纵向)和福格特(横向)配置的光入射在一个半无限的WSM表面没有费米弧。我们使用一个极小模型的WSM与四个倾斜的Weyl节点相关的镜像和时间反演对称。在Voigt配置中,克尔角的大峰值出现在等离子体频率处。我们发现,随着磁场的增加,这个峰的频率蓝移是在MOKE的手征异常的签名。

英文摘要:

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.

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