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Discovery of a Weyl fermion semimetal and topological Fermi arcs

Author(s): Xu, S-Y; Belopolski, I; Alidoust, N; Neupane, M; Bian, G; et al

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Abstract: A Weyl semimetal is a new state of matter that hosts Weyl fermions as emergent quasiparticles and admits a topological classification that protects Fermi arc surface states on the boundary of a bulk sample. This unusual electronic structure has deep analogies with particle physics and leads to unique topological properties. We report the experimental discovery of a Weyl semimetal, tantalum arsenide (TaAs). Using photoemission spectroscopy, we directly observe Fermi arcs on the surface, as well as the Weyl fermion cones and Weyl nodes in the bulk of TaAs single crystals. We find that Fermi arcs terminate on the Weyl fermion nodes, consistent with their topological character. Our work opens the field for the experimental study of Weyl fermions in physics and materials science.
Publication Date: 7-Aug-2015
Electronic Publication Date: 16-Jul-2015
Citation: Xu, S-Y, Belopolski, I, Alidoust, N, Neupane, M, Bian, G, Zhang, C, Sankar, R, Chang, G, Yuan, Z, Lee, C-C, Huang, S-M, Zheng, H, Ma, J, Sanchez, DS, Wang, B, Bansil, A, Chou, F, Shibayev, PP, Lin, H, Jia, S, Hasan, MZ. (2015). Discovery of a Weyl fermion semimetal and topological Fermi arcs. Science, 349 (6248), 613 - 617. doi:10.1126/science.aaa9297
DOI: doi:10.1126/science.aaa9297
ISSN: 0036-8075
EISSN: 1095-9203
Pages: 613 - 617
Type of Material: Journal Article
Journal/Proceeding Title: Science
Version: Author's manuscript

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