Discovery of a Weyl fermion semimetal and topological Fermi arcs
2015/02/28 by Su-Yang Xu, Ilya Belopolski, Nasser Alidoust +18 · 113 citations
Materials Science · Physics and Astronomy · #Chemical and Physical Properties of Materials #Fermi Gamma-ray Space Telescope #Fermion #Graphene research and applications #Quasiparticle #Semimetal #Topological Materials and Phenomena #Topological order #Topology (electrical circuits) #Weyl semimetal #cond-mat.mes-hall
paper · pdf · doi:10.1126/science.aaa9297
published as Science (2015) 16-July · This work (Science 2015) is based on the first theoretical prediction of TaAs family as Weyl Semimetals, see Nature Commun. (November, 2014) our earlier theory work at http://www.nature.com/ncomms/2015/150612/ncomms8373/full/ncomms8373.html (November, 2014), arXiv:1501.00755
openalex publication_date 2015/07/17 · arxiv created 2015/07/19 · arxiv updated 2015/09/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.
Citations
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