淡江大學機構典藏:Item 987654321/117361
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    题名: Spin Polarization and Texture of the Fermi Arcs in the Weyl Fermion Semimetal TaAs
    作者: Xu, Su-Yang;Belopolski, Ilya;Sanchez, Daniel S.;Neupane, Madhab;Chang, Guoqing;Yaji, Koichiro;Yuan, Zhujun;Zhang, Chenglong;Kuroda, Kenta;Bian, Guang;Guo, Cheng;Lu, Hong;Chang, Tay-Rong;Alidoust, Nasser;Zheng, Hao;Lee, Chi-Cheng;Huang, Shin-Ming;Hsu, Chuang-Han;Jeng, Horng-Tay;Bansil, Arun;Neupert, Titus;Komori, Fumio;Kondo, Takeshi;Shin, Shik;Lin, Hsin;Jia, Shuang;Hasan, M. Zahid
    关键词: Fermi surface;Spin polarization;Weyl fermions
    日期: 2016-03
    上传时间: 2019-10-10 12:10:41 (UTC+8)
    出版者: American Physical Society
    摘要: A Weyl semimetal is a new state of matter that hosts Weyl fermions as quasiparticle excitations. The Weyl fermions at zero energy correspond to points of bulk-band degeneracy, called Weyl nodes, which are separated in momentum space and are connected only through the crystal’s boundary by an exotic Fermi arc surface state. We experimentally measure the spin polarization of the Fermi arcs in the first experimentally discovered Weyl semimetal TaAs. Our spin data, for the first time, reveal that the Fermi arcs’ spin-polarization magnitude is as large as 80% and lies completely in the plane of the surface. Moreover, we demonstrate that the chirality of the Weyl nodes in TaAs cannot be inferred by the spin texture of the Fermi arcs. The observed nondegenerate property of the Fermi arcs is important for establishing its exact topological nature, which reveals that spins on the arc form a novel type of 2D matter. Additionally, the nearly full spin polarization we observed (∼80%) may be useful in spintronic applications.
    關聯: Phys. Rev. Lett. 116, 096801
    DOI: 10.1103/PhysRevLett.116.096801
    显示于类别:[物理學系暨研究所] 期刊論文

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