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Nodal plane and persistent spin texture in a Weyl semimetal without mirror symmetry

机译:Weyl半金属中无镜面对称的节点面和持续自旋织构

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摘要

By utilizing symmetry analysis and electronic structure calculations, we investigated the low-temperature orthorhombic phase of Ag_2,Se in SG 17. In addition to the discovery of a nodal plane at k_z = π protected by the joint operation of time reversal (T) and the twofold screw rotation 5V, we found 24 Weyl points mainly residing at the k_y = 0 plane with notable Fermi arc and large quasiparticle interference pattern (QPI). Due to the absence of mirror symmetry, a pair of Weyl points with opposite chirality reside at different binding energies, which makes this system an excellent material candidate for realizing the novel chiral anomaly related phenomenon, such as the quantized circular photogalvanic and the chiral magnetic effects. Furthermore, we also reveal the striking spin textures at k_z = π plane which demonstrates, in a large region of the surface Brillouin zone, a direction-selective spin polarization, which has a strong implication to spintronic applications.
机译:通过利用对称性分析和电子结构计算,我们研究了SG 17中Ag_2,Se的低温正交相。除了在k_z =π处发现一个受时间反转(T)和时间联合操作保护的节点平面之外,在5V的双重螺旋旋转下,我们发现24个Weyl点主要位于k_y = 0平面上,具有明显的费米弧和较大的准粒子干涉图样(QPI)。由于没有镜像对称性,一对具有相反手性的Weyl点位于不同的结合能上,这使得该系统成为实现新颖的与手性异常有关的现象(如定量圆形光电动势和手性磁效应)的极佳材料候选。此外,我们还揭示了在k_z =π平面处的惊人自旋纹理,这表明在表面布里渊区的大部分区域中,有方向选择性的自旋极化,这对自旋电子学应用具有重要意义。

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  • 来源
    《Physical review》 |2020年第12期|125207.1-125207.7|共7页
  • 作者

    Wujun Shi; Gang Li;

  • 作者单位

    School of Physical Science and Technology ShanghaiTech University Shanghai 200031 China;

    School of Physical Science and Technology ShanghaiTech University Shanghai 200031 China ShanghaiTech Laboratory for Topological Physics ShanghaiTech University Shanghai 200031 China;

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  • 正文语种 eng
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