Discovery of a Weyl fermion state with Fermi arcs in niobium arsenide

doi:10.1038/nphys3437

淡江大學機構典藏 > 理學院 > 物理學系暨研究所 > 期刊論文 > Item 987654321/117351

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題名:	Discovery of a Weyl fermion state with Fermi arcs in niobium arsenide
作者:	Xu, Su-Yang;Alidoust, Nasser;Belopolski, Ilya;Yuan, Zhujun;Bian, Guang;Chang, Tay-Rong;Zheng, Hao;Strocov, Vladimir N.;Sanchez, Daniel S.;Chang, Guoqing;Zhang, Chenglong;Mou, Daixiang;Wu, Yun;Huang, Lunan;Lee, Chi-Cheng;Huang, Shin-Ming;Wang, BaoKai;Bansil, Arun;Jeng, Horng-Tay;Neupert, Titus;Kaminski, Adam;Lin, Hsin;Jia, Shuang;Hasan, M. Zahid
日期:	2015-08-17
上傳時間:	2019-10-10 12:10:23 (UTC+8)
出版者:	Springer Nature Limited
摘要:	Three types of fermions play a fundamental role in our understanding of nature: Dirac, Majorana and Weyl. Whereas Dirac fermions have been known for decades, the latter two have not been observed as any fundamental particle in high-energy physics, and have emerged as a much-sought-out treasure in condensed matter physics. A Weyl semimetal is a novel crystal whose low-energy electronic excitations behave as Weyl fermions. It has received worldwide interest and is believed to open the next era of condensed matter physics after graphene and three-dimensional topological insulators. However, experimental research has been held back because Weyl semimetals are extremely rare in nature. Here, we present the experimental discovery of the Weyl semimetal state in an inversion-symmetry-breaking single-crystalline solid, niobium arsenide (NbAs). Utilizing the combination of soft X-ray and ultraviolet photoemission spectroscopy, we systematically study both the surface and bulk electronic structure of NbAs. We experimentally observe both the Weyl cones in the bulk and the Fermi arcs on the surface of this system. Our ARPES data, in agreement with our theoretical band structure calculations, identify the Weyl semimetal state in NbAs, which provides a real platform to test the potential of Weyltronics.
關聯:	Nature Physics 11, 748
DOI:	10.1038/nphys3437
顯示於類別:	[物理學系暨研究所] 期刊論文

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