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 JengTakeshi Kondo, Hsin Lin, Zheng Liu, Fengqi Song, Shik Shin, M. Zahid Hasan

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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 Mo x W 1â 'x Te 2 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 Mo x W 1â 'x Te 2 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 Mo x W 1â 'x Te 2 is a Type II Weyl semimetal. We also find that certain Weyl points are at the Fermi level, making Mo x W 1â 'x Te 2 a promising platform for transport and optics experiments on Weyl semimetals.

Original languageEnglish (US)
Article number13643
JournalNature communications
Volume7
DOIs
StatePublished - Dec 5 2016

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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    Belopolski, I., Sanchez, D. S., Ishida, Y., Pan, X., Yu, P., Xu, S. Y., Chang, G., Chang, T. R., Zheng, H., Alidoust, N., Bian, G., Neupane, M., Huang, S. M., Lee, C. C., Song, Y., Bu, H., Wang, G., Li, S., Eda, G., ... Zahid Hasan, M. (2016). Discovery of a new type of topological Weyl fermion semimetal state in MoxW1-xTe2. Nature communications, 7, [13643]. https://doi.org/10.1038/ncomms13643