Observation of Fermi arc and its connection with bulk states in the candidate type-II Weyl semimetal WTe2

Chenlu Wang, Yan Zhang, Jianwei Huang, Simin Nie, Guodong Liu, Aiji Liang, Yuxiao Zhang, Bing Shen, Jing Liu, Cheng Hu, Ying Ding, Defa Liu, Yong Hu, Shaolong He, Lin Zhao, Li Yu, Jin Hu, Jiang Wei, Zhiqiang Mao, Youguo ShiXiaowen Jia, Fengfeng Zhang, Shenjin Zhang, Feng Yang, Zhimin Wang, Qinjun Peng, Hongming Weng, Xi Dai, Zhong Fang, Zuyan Xu, Chuangtian Chen, X. J. Zhou

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Abstract

A kind of topological material, the type-II Weyl semimetal, was proposed recently where the Weyl points emerge at the contact points of the electron and hole pockets, resulting in a highly tilted Weyl cone. In type-II Weyl semimetals, the Lorentz invariance is violated and a different type of Weyl fermion is generated that leads to intriguing physical properties. WTe2 is interesting because it is predicted to be a good candidate for realizing type-II Weyl semimetals. By utilizing laser-based angle-resolved photoemission spectroscopy with high energy and momentum resolutions, we have revealed a full picture of the electronic structure of WTe2. A clear surface state has been identified and its connection with the bulk electronic states in the momentum and energy space shows good agreement with band structure calculations. Our results provide electronic signatures that are consistent with type-II Weyl states in WTe2. They lay a foundation for further investigations on the topological nature of WTe2 and the exploration of unique phenomena and physical properties in type-II Weyl semimetals.

Original languageEnglish (US)
Article number241119
JournalPhysical Review B
Volume94
Issue number24
DOIs
StatePublished - Dec 30 2016

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Wang, C., Zhang, Y., Huang, J., Nie, S., Liu, G., Liang, A., Zhang, Y., Shen, B., Liu, J., Hu, C., Ding, Y., Liu, D., Hu, Y., He, S., Zhao, L., Yu, L., Hu, J., Wei, J., Mao, Z., ... Zhou, X. J. (2016). Observation of Fermi arc and its connection with bulk states in the candidate type-II Weyl semimetal WTe2. Physical Review B, 94(24), [241119]. https://doi.org/10.1103/PhysRevB.94.241119