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: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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