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Weyl semimetal phase in the non-centrosymmetric compound TaAs

DOI: 10.1038/nphys3425 DOI Help

Authors: L. X. Yang (Tsinghua University; Physics Department, Oxford University) , Z. K. Liu (Diamond Light Source) , Y. Sun (Max Planck Institute for Chemical Physics of Solids) , H. Peng (Physics Department, Oxford University) , H. F. Yang (Physics Department, Oxford University) , T. Zhang (Tsinghua University; Physics Department, Oxford University) , Binbin Zhou (University of Oxford) , Y Zhang (Advanced Light Source, Lawrence Berkeley National Laboratory) , Y. F. Guo (Physics Department, Oxford University) , Marein Rahn (University of Oxford) , D. Prabhakaran (Physics Department, Oxford University) , Z. Hussain (Advanced Light Source, Lawrence Berkeley National Laboratory) , S. K. Mo (Advanced Light Source, Lawrence Berkeley National Laboratory) , C. Felser (Max Planck Institute for Chemical Physics of Solids) , B. Yan (Max Planck Institute for Chemical Physics of Solids) , Y. L. Chen (Tsinghua University; Physics Department, Oxford University; Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nature Physics , VOL 11 (9) , PAGES 728 - 732

State: Published (Approved)
Published: August 2015
Diamond Proposal Number(s): 13177

Abstract: Three-dimensional (3D) topologicalWeyl semimetals (TWSs) represent a state of quantum matter with unusual electronic structures that resemble both a ‘3D graphene’ and a topological insulator. Their electronic structure displays pairs of Weyl points (through which the electronic bands disperse linearly along all three momentum directions) connected by topological surface states, forming a unique arc-like Fermi surface (FS). Each Weyl point is chiral and contains half the degrees of freedom of a Dirac point, and can be viewed as a magnetic monopole in momentum space. By performing angle-resolved photoemission spectroscopy on the non-centrosymmetric compound TaAs, here we report its complete band structure, including the unique Fermi-arc FS and linear bulk band dispersion across the Weyl points, in agreement with the theoretical calculations1, 2. This discovery not only confirms TaAs as a 3DTWS, but also provides an ideal platform for realizing exotic physical phenomena (for example, negative magnetoresistance, chiral magnetic effects and the quantum anomalous Hall effect) which may also lead to novel future applications.

Subject Areas: Physics


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