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Discovery of a Weyl fermion semimetal and topological Fermi arcs

DOI: 10.1126/science.aaa9297 DOI Help
PMID: 26184916 PMID Help

Authors: S. Y. Xu (Princeton University) , Ilya Belopolski (Princeton University) , N. Alidoust (Princeton University) , M. Neupane (Princeton University) , G. Bian (Princeton University) , C. Zhang (Peking University) , R. Sankar (National Taiwan University) , G. Chang (University of Singapore) , Z. Yuan (University of Singapore) , C. C. Lee (University of Singapore) , S. M. Huang (University of Singapore) , H. Zheng (Princeton University) , J. Ma (National Laboratory, Oak Ridge) , D. S. Sanchez (Princeton University) , B. Wang (University of Singapore) , A. Bansil (Northeastern University) , F. Chou (National Taiwan University) , Pavel Shibayev (Princeton University) , H. Lin (University of Singapore) , M. Zahid Hasan (Princeton University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Science , VOL 349 (6248) , PAGES 613 - 617

State: Published (Approved)
Published: August 2015
Diamond Proposal Number(s): 10074

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.

Journal Keywords: Weyl Fermion Semimetal

Subject Areas: Physics

Instruments: I05-ARPES

Other Facilities: Advanced Light Source, the Stanford Synchrotron Radiation Lightsource, and the Swiss Light Source

Added On: 14/09/2015 16:45

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