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https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/117348
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| 題名: | Criteria for Directly Detecting Topological Fermi Arcs in Weyl Semimetals |
| 作者: | 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 |
| 日期: | 2016-02-10 |
| 上傳時間: | 2019-10-10 12:10:18 (UTC+8) |
| 出版者: | American Physical Society |
| 摘要: | 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. Here 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 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. We further 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. |
| 關聯: | Phys. Rev. Lett. 116, 066802 |
| DOI: | 10.1103/PhysRevLett.116.066802 |
| 顯示於類別: | [物理學系暨研究所] 期刊論文
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