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Type-III Weyl semimetals: (TaSe4)2I

Xiao-Ping Li, Ke Deng, Botao Fu, YongKai Li, Da-Shuai Ma, JunFeng Han, Jianhui Zhou, Shuyun Zhou, and Yugui Yao
Phys. Rev. B 103, L081402 – Published 10 February 2021
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Abstract

Weyl semimetals have been classified into type I and type II with respect to the geometry of their Fermi surfaces at the Weyl points. we propose another class of Weyl semimetal, whose unique Fermi surface contains two electron or two hole pockets touching at a multi-Weyl point, dubbed a type-III Weyl semimetal. Based on first-principles calculations, we first show that the quasi-one-dimensional compound (TaSe4)2I is a type-III Weyl semimetal with larger chiral charges. (TaSe4)2I can support fourfold helicoidal surface states with long Fermi arcs on the (001) surface. Angle-resolved photoemission spectroscopy measurements are in agreement with the gapless nature of (TaSe4)2I at room temperature and reveal its characteristic dispersion. In addition, our calculations show that external strain could induce transitions in (TaSe4)2I among the type-III, type-II, and type-I Weyl semimetals, accompanied with the Lifshitz transitions of the Fermi surfaces. Therefore, our work experimentally indicates (TaSe4)2I as a type-III Weyl semimetal and provides a promising platform to further investigate the physics of type-III Weyl fermions.

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  • Received 9 October 2019
  • Accepted 25 January 2021

DOI:https://doi.org/10.1103/PhysRevB.103.L081402

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Xiao-Ping Li1,*, Ke Deng2,*, Botao Fu3,1,*, YongKai Li1,*, Da-Shuai Ma1, JunFeng Han1, Jianhui Zhou4,†, Shuyun Zhou2,5, and Yugui Yao1,‡

  • 1Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), Beijing Key Laboratory of Nanophotonics & Ultrafine Optoelectronic Systems, and School of Physics, Beijing Institute of Technology, Beijing 100081, China
  • 2State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China
  • 3College of Physics and Electronic Engineering, Center for Computational Sciences, Sichuan Normal University, Chengdu 610068, China
  • 4Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences (CAS), Hefei 230031, Anhui, China
  • 5Frontier Science Center for Quantum Information, Beijing 100084, China

  • *These authors contributed equally to this work.
  • jhzhou@hmfl.ac.cn
  • ygyao@bit.edu.cn

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Issue

Vol. 103, Iss. 8 — 15 February 2021

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