Criteria for Directly Detecting Topological Fermi Arcs in Weyl Semimetals
學年 104
學期 2
出版（發表）日期 2016-02-10
作品名稱 Criteria for Directly Detecting Topological Fermi Arcs in Weyl Semimetals
作品名稱（其他語言）
著者 Ilya Belopolski; Su-Yang Xu; Daniel S. Sanchez; Guoqing Chang; Cheng Guo; Madhab Neupane; Hao Zheng; Chi-Cheng Lee; Shin-Ming Huang; Guang Bian; Nasser Alidoust; Tay-Rong Chang; BaoKai Wang; Xiao Zhang; Arun Bansil; Horng-Tay Jeng; Hsin Lin; Shuang Jia; M. Zahid Hasan
單位
出版者
著錄名稱、卷期、頁數 Phys. Rev. Lett. 116, 066802
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.
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語言 en_US
ISSN
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 是
國別 USA
公開徵稿
出版型式 ,電子版
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機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/117348 )