Criteria for Directly Detecting Topological Fermi Arcs in Weyl Semimetals

Belopolski, Ilya; Xu, Su-Yang; Sanchez, Daniel S.; Chang, Guoqing; Guo, Cheng; Neupane, Madhab; Zheng, Hao; Lee, Chi-Cheng; Huang, Shin-Ming; Bian, Guang; Alidoust, Nasser; Chang, Tay-Rong; Wang, BaoKai; Zhang, Xiao; Bansil, Arun; Jeng, Horng-Tay; Lin, Hsin; Jia, Shuang; Hasan, M. Zahid

doi:10.1103/PhysRevLett.116.066802

Criteria for Directly Detecting Topological Fermi Arcs in Weyl Semimetals

Journal Article · Tue Feb 09 23:00:00 EST 2016 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.116.066802· OSTI ID:1352386

Belopolski, Ilya ^[1]; Xu, Su-Yang ^[1]; Sanchez, Daniel S. ^[1]; Chang, Guoqing ^[2]; Guo, Cheng ^[3]; Neupane, Madhab ^[4]; Zheng, Hao ^[1]; Lee, Chi-Cheng ^[2]; Huang, Shin-Ming ^[2]; Bian, Guang ^[1]; Alidoust, Nasser ^[1]; Chang, Tay-Rong ^[5]; Wang, BaoKai ^[6]; Zhang, Xiao ^[3]; Bansil, Arun ^[7]; Jeng, Horng-Tay ^[8]; Lin, Hsin ^[2]; Jia, Shuang ^[3]; Hasan, M. Zahid ^[1]

Princeton Univ., NJ (United States). Lab. for Topological Quantum Matter and Spectroscopy
National Univ. of Singapore (Singapore). Centre for Advanced 2D Materials and Graphene Research Centre and Dept. of PHysics
Peking Univ., Beijing (China). International Center for Quantum Materials
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
Princeton Univ., NJ (United States). Lab. for Topological Quantum Matter and Spectroscopy; National Tsing Hua Univ., Hsinchu (Taiwan). Dept. of Physics
National Univ. of Singapore (Singapore). Centre for Advanced 2D Materials and Graphene Research Centre and Dept. of PHysics; Northeastern Univ., Boston, MA (United States). Dept. of Physics
Northeastern Univ., Boston, MA (United States). Dept. of Physics
National Tsing Hua Univ., Hsinchu (Taiwan). Dept. of Physics; Academia Sinica, Taipei (Taiwan). Inst. of Physics

The recent discovery of the first Weyl semimetal in TaAs provides the first observation of a Weyl fermion in nature and demonstrates a novel type of anomalous surface state, the Fermi arc. Like topological insulators, the bulk topological invariants of a Weyl semimetal are uniquely fixed by the surface states of a bulk sample. We present a set of distinct conditions, accessible by angle-resolved photoemission spectroscopy (ARPES), each of which demonstrates topological Fermi arcs in a surface state band structure, with minimal reliance on calculation. We also apply these results to TaAs and NbP. For the first time, we rigorously demonstrate a nonzero Chern number in TaAs by counting chiral edge modes on a closed loop. Furthermore, we show that it is unreasonable to directly observe Fermi arcs in NbP by ARPES within available experimental resolution and spectral linewidth. Our results are general and apply to any new material to demonstrate a Weyl semimetal.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

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

OSTI ID:: 1352386

Alternate ID(s):: OSTI ID: 1237788

Report Number(s):: LA-UR--17-22127

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 6 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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