教師資料查詢 | 類別: 期刊論文 | 教師: 李啟正 LEE, CHI-CHENG (瀏覽個人網頁)

標題: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.
關鍵字
語言英文(美國)
ISSN
期刊性質國外
收錄於SCI;
產學合作
通訊作者
審稿制度
國別美國
公開徵稿
出版型式,電子版
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