Experimental discovery of a topological Weyl semimetal state in TaP

doi:10.1126/sciadv.1501092

淡江大學機構典藏 > 理學院 > 物理學系暨研究所 > 期刊論文 > Item 987654321/117357

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题名:	Experimental discovery of a topological Weyl semimetal state in TaP
作者:	Xu, Su-Yang;Belopolski, Ilya;Sanchez, Daniel S.;Zhang, Chenglong;Chang, Guoqing;Guo, Cheng;Bian, Guang;Yuan, Zhujun;Lu, Hong;Chang, Tay-Rong;Shibayev, Pavel P.;Prokopovych, Mykhailo L.;Alidoust, Nasser;Zheng, Hao;Lee, Chi-Cheng;Huang, Shin-Ming;Sankar, Raman;Chou, Fangcheng;Hsu, Chuang-Han;Jeng, Horng-Tay;Bansil, Arun;Neupert, Titus;Strocov, Vladimir N.;Lin, Hsin;Jia, Shuang;Hasan, M. Zahid
日期:	2015-11-13
上传时间:	2019-10-10 12:10:34 (UTC+8)
出版者:	American Association for the Advancement of Science
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.
關聯:	Science Advances 1, e1501092
DOI:	10.1126/sciadv.1501092
显示于类别:	[物理學系暨研究所] 期刊論文

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