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

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 Huang, Chi-Cheng Lee, You Song, Haijun Bu, Guanghou Wang, Shisheng Li, Goki Eda, Horng-Tay Jeng, Takeshi Kondo, Hsin Lin, Zheng Liu (), Fengqi Song (), Shik Shin and M. Zahid Hasan ()
Additional contact information
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
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
Chi-Cheng Lee: Centre for Advanced 2D Materials and Graphene Research Centre, 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
Goki Eda: Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore
Horng-Tay Jeng: National Tsing Hua University
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
Zheng Liu: Centre for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University
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

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: 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.

Date: 2016
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DOI: 10.1038/ncomms13643

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