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Topological surface Fermi arcs in the magnetic Weyl semimetal Co_3Sn_2S_2

机译：磁性Weyl半金属Co_3Sn_2S_2中的拓扑表面费米弧

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摘要

Very recently, the halt-metallic compound Co_3Sn_2S_2 was proposed to be a magnetic Weyl semimetal (WSM) with Weyl points only 60 meV above the Fermi level E_F. Owing to the low charge carrier density and large Berry curvature induced. Co_3Sn_2S_2 possesses both a large anomalous Hall conductivity and a large anomalous Hall angle, which provide strong evidence for the existence of Weyl points in Co_3Sn_2S-2. In this work, we theoretically study the surface topological feature of Co_3Sn_2S_2 and its counterpart Co_3Sn_2Se_2. By cleaving the sample at the weak Sn-S/Se bonds, one can achieve two different surfaces terminated with Sn and S/Se atoms, respectively. The resulting Fermi-arc-related states can range from the energy of the Weyl points to E_F - 0.1 eV in the Sn-terminated surface. Therefore, it should be possible to observe the Fermi arcs in angle-resolved photoemission spectroscopy (ARPES) measurements. Furthermore, in order to simulate quasiparticle interference in scanning tunneling microscopy (STM) measurements, we also calculate the joint density of states for both terminals. This work should be helpful for a comprehensive understanding of the topological properties of these two magnetic WSMs and further ARPES and STM measurements.
机译：最近，有人提出将停滞金属化合物Co_3Sn_2S_2是一种磁性Weyl半金属（WSM），其Weyl点仅比费米能级E_F高60 meV。由于低的载流子密度和大的贝里曲率引起。 Co_3Sn_2S_2具有较大的异常霍尔电导率和较大的异常霍尔角，为Co_3Sn_2S-2中存在Weyl点提供了有力的证据。在这项工作中，我们从理论上研究了Co_3Sn_2S_2及其对应的Co_3Sn_2Se_2的表面拓扑特征。通过以弱的Sn-S / Se键裂解样品，可以实现两个分别以Sn和S / Se原子封端的不同表面。最终的费米弧相关状态的范围可以从Weyl点的能量到Sn终止表面中的E_F-0.1 eV。因此，应该可以在角度分辨光发射光谱（ARPES）测量中观察费米弧。此外，为了在扫描隧道显微镜（STM）测量中模拟准粒子干扰，我们还计算了两个端子的状态联合密度。这项工作应有助于全面了解这两个磁性WSM的拓扑特性以及进一步的ARPES和STM测量。

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  • 来源
    《Physical review. B, Condensed Matter And Materals Physics》 |2018年第23期|235416.1-235416.8|共8页
  • 作者

    Qiunan Xu; Enke Liu; Wujun Shi; Lukas Muechler; Jacob Gayles; Claudia Felser; Yan Sun;

  • 作者单位

    Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany;

    Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany,Institute of Physics. Chinese Academy of Sciences. Beijing 100190. China;

    Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany,School of Physical Science and Technology, ShanghaiTech University, Shanghai 200031, China;

    Department of Chemistry, Princeton University, Princeton. New Jersey 08544, USA;

    Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany;

    Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany;

    Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany;

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