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Discovery of a new type of topological Weyl fermion semimetal state in MoxW1−xTe2

Author

Listed:
  • Ilya Belopolski

    (Laboratory for Topological Quantum Matter and Spectroscopy (B7), Princeton University)

  • Daniel S. Sanchez

    (Laboratory for Topological Quantum Matter and Spectroscopy (B7), Princeton University)

  • Yukiaki Ishida

    (The Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa-no-ha)

  • Xingchen Pan

    (National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Nanjing University)

  • Peng Yu

    (Centre for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University)

  • Su-Yang Xu

    (Laboratory for Topological Quantum Matter and Spectroscopy (B7), Princeton University)

  • Guoqing Chang

    (Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore
    National University of Singapore)

  • Tay-Rong Chang

    (National Tsing Hua University)

  • Hao Zheng

    (Laboratory for Topological Quantum Matter and Spectroscopy (B7), Princeton University)

  • Nasser Alidoust

    (Laboratory for Topological Quantum Matter and Spectroscopy (B7), Princeton University)

  • Guang Bian

    (Laboratory for Topological Quantum Matter and Spectroscopy (B7), Princeton University)

  • Madhab Neupane

    (University of Central Florida)

  • Shin-Ming Huang

    (Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore
    National University of Singapore)

  • Chi-Cheng Lee

    (Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore
    National University of Singapore)

  • You Song

    (State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University)

  • Haijun Bu

    (National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Nanjing University)

  • Guanghou Wang

    (National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Nanjing University)

  • Shisheng Li

    (Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore
    National University of Singapore)

  • Goki Eda

    (Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore
    National University of Singapore
    National University of Singapore)

  • Horng-Tay Jeng

    (National Tsing Hua University
    Institute of Physics, Academia Sinica)

  • Takeshi Kondo

    (The Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa-no-ha)

  • Hsin Lin

    (Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore
    National University of Singapore)

  • Zheng Liu

    (Centre for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University
    NOVITAS, Nanoelectronics Centre of Excellence, School of Electrical and Electronic Engineering, Nanyang Technological University
    CINTRA CNRS/NTU/THALES, UMI 3288, Research Techno Plaza)

  • Fengqi Song

    (National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Nanjing University)

  • Shik Shin

    (The Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa-no-ha)

  • M. Zahid Hasan

    (Laboratory for Topological Quantum Matter and Spectroscopy (B7), Princeton University
    Princeton Institute for Science and Technology of Materials, Princeton University)

Abstract

The recent discovery of a Weyl semimetal in TaAs offers the first Weyl fermion observed in nature and dramatically broadens the classification of topological phases. However, in TaAs it has proven challenging to study the rich transport phenomena arising from emergent Weyl fermions. The series MoxW1−xTe2 are inversion-breaking, layered, tunable semimetals already under study as a promising platform for new electronics and recently proposed to host Type II, or strongly Lorentz-violating, Weyl fermions. Here we report the discovery of a Weyl semimetal in MoxW1−xTe2 at x=25%. We use pump-probe angle-resolved photoemission spectroscopy (pump-probe ARPES) to directly observe a topological Fermi arc above the Fermi level, demonstrating a Weyl semimetal. The excellent agreement with calculation suggests that MoxW1−xTe2 is a Type II Weyl semimetal. We also find that certain Weyl points are at the Fermi level, making MoxW1−xTe2 a promising platform for transport and optics experiments on Weyl semimetals.

Suggested Citation

  • Ilya Belopolski & Daniel S. Sanchez & Yukiaki Ishida & Xingchen Pan & Peng Yu & Su-Yang Xu & Guoqing Chang & Tay-Rong Chang & Hao Zheng & Nasser Alidoust & Guang Bian & Madhab Neupane & Shin-Ming Huan, 2016. "Discovery of a new type of topological Weyl fermion semimetal state in MoxW1−xTe2," Nature Communications, Nature, vol. 7(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13643
    DOI: 10.1038/ncomms13643
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