Experimental discovery of a topological Weyl semimetal state in TaP
學年 104
學期 1
出版（發表）日期 2015-11-13
作品名稱 Experimental discovery of a topological Weyl semimetal state in TaP
作品名稱（其他語言）
著者 Su-Yang Xu; Ilya Belopolski; Daniel S. Sanchez; Chenglong Zhang; Guoqing Chang; Cheng Guo; Guang Bian; Zhujun Yuan; Hong Lu; Tay-Rong Chang; Pavel P. Shibayev; Mykhailo L. Prokopovych; Nasser Alidoust; Hao Zheng; Chi-Cheng Lee; Shin-Ming Huang; Raman Sankar; Fangcheng Chou; Chuang-Han Hsu; Horng-Tay Jeng; Arun Bansil; Titus Neupert; Vladimir N. Strocov; Hsin Lin; Shuang Jia; M. Zahid Hasan
單位
出版者
著錄名稱、卷期、頁數 Science Advances 1, e1501092
摘要 Weyl semimetals are expected to open up new horizons in physics and materials science because they provide the first realization of Weyl fermions and exhibit protected Fermi arc surface states. However, they had been found to be extremely rare in nature. Recently, a family of compounds, consisting of tantalum arsenide, tantalum phosphide (TaP), niobium arsenide, and niobium phosphide, was predicted as a Weyl semimetal candidates. We experimentally realize a Weyl semimetal state in TaP. Using photoemission spectroscopy, we directly observe the Weyl fermion cones and nodes in the bulk, and the Fermi arcs on the surface. Moreover, we find that the surface states show an unexpectedly rich structure, including both topological Fermi arcs and several topologically trivial closed contours in the vicinity of the Weyl points, which provides a promising platform to study the interplay between topological and trivial surface states on a Weyl semimetal’s surface. We directly demonstrate the bulk-boundary correspondence and establish the topologically nontrivial nature of the Weyl semimetal state in TaP, by resolving the net number of chiral edge modes on a closed path that encloses the Weyl node. This also provides, for the first time, an experimentally practical approach to demonstrating a bulk Weyl fermion from a surface state dispersion measured in photoemission.
關鍵字
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/987654321/117357 )