Spin Polarization and Texture of the Fermi Arcs in the Weyl Fermion Semimetal TaAs

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

doi:10.1103/PhysRevLett.116.096801

Spin Polarization and Texture of the Fermi Arcs in the Weyl Fermion Semimetal TaAs

Journal Article · Tue Mar 01 00:00:00 EST 2016 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.116.096801· OSTI ID:1414083

Xu, Su-Yang ^[1]; Belopolski, Ilya ^[1]; Sanchez, Daniel S. ^[1]; Neupane, Madhab ^[2]; Chang, Guoqing ^[3]; Yaji, Koichiro ^[4]; Yuan, Zhujun ^[5]; Zhang, Chenglong ^[5]; Kuroda, Kenta ^[4]; Bian, Guang ^[1]; Guo, Cheng ^[5]; Lu, Hong ^[5]; Chang, Tay-Rong ^[6]; Alidoust, Nasser ^[1]; Zheng, Hao ^[1]; Lee, Chi-Cheng ^[3]; Huang, Shin-Ming ^[3]; Hsu, Chuang-Han ^[3]; Jeng, Horng-Tay ^[7]; Bansil, Arun ^[8] more »

Princeton Univ., NJ (United States). Dept. of Physics, Lab. for Topological Quantum Matter and Spectroscopy
Princeton Univ., NJ (United States). Dept. of Physics, Lab. for Topological Quantum Matter and Spectroscopy; Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Condensed Matter and Magnet Science Group; Univ. of Central Florida, Orlando, FL (United States). Dept. of Physics
Centre for Advanced 2D Materials and Graphene Research Centre National Univ. of Singapore (Singapore); National Univ. of Singapore (Singapore). Dept. of Physics
Univ of Tokyo, Chiba (Japan). Inst. for Solid State Physics (ISSP)
Peking Univ., Beijing (China). International Center for Quantum Materials, School of Physics
National Tsing Hua Univ., Hsinchu (Taiwan). Dept. of Physics
National Tsing Hua Univ., Hsinchu (Taiwan). Dept. of Physics; Academia Sinica, Taipei (Taiwan). Inst. of Physics
Northeastern Univ., Boston, MA (United States). Dept. of Physics
Princeton Univ., NJ (United States). Joseph Henry lab., Dept. of Physics
Peking Univ., Beijing (China). International Center for Quantum Materials, School of Physics; Collaborative Innovation Center of Quantum Matter, Beijing (China)

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. Here, 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. In addition, the nearly full spin polarization we observed (~80%) may be useful in spintronic applications.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231; AC52-06NA25396; FG02-05ER46200; FG02-07ER46352

OSTI ID:: 1414083

Alternate ID(s):: OSTI ID: 1239862

Report Number(s):: LA-UR--15-28623

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 9 Vol. 116; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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