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Discovery of Weyl Fermion Semimetals and Topological Fermi Arc States

Author(s): Hasan, M. Zahid; Xu, Su-Yang; Belopolski, Ilya; Huang, Shin-Ming

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Abstract: Weyl semimetals are conductors whose low-energy bulk excitations are Weyl fermions, whereas their surfaces possess metallic Fermi arc surface states. These Fermi arc surface states are protected by a topological invariant associated with the bulk electronic wavefunctions of the material. Recently, it has been shown that the TaAs and NbAs classes of materials harbor such a state of topological matter. We review the basic phenomena and experimental history of the discovery of the first Weyl semimetals, starting with the observation of topological Fermi arcs and Weyl nodes in TaAs and NbAs by angle and spin-resolved surface and bulk sensitive photoemission spectroscopy and continuing through magnetotransport measurements reporting the Adler-Bell-Jackiw chiral anomaly. We hope that this article provides a useful introduction to the theory of Weyl semimetals, a summary of recent experimental discoveries, and a guideline to future directions.
Publication Date: 31-Mar-2017
Citation: Hasan, M Zahid, Xu, Su-Yang, Belopolski, Ilya, Huang, Shin-Ming. (2017). Discovery of Weyl Fermion Semimetals and Topological Fermi Arc States. Annual Review of Condensed Matter Physics, 8 (1), 289 - 309. doi:10.1146/annurev-conmatphys-031016-025225
DOI: doi:10.1146/annurev-conmatphys-031016-025225
ISSN: 1947-5454
EISSN: 1947-5462
Pages: 289 - 309
Type of Material: Journal Article
Journal/Proceeding Title: Annual Review of Condensed Matter Physics
Version: Author's manuscript

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