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Experimental observation of topological Fermi arcs in type-II Weyl semimetal MoTe 2

  • Author(s): Deng, K;
  • Wan, G;
  • Deng, P;
  • Zhang, K;
  • Ding, S;
  • Wang, E;
  • Yan, M;
  • Huang, H;
  • Zhang, H;
  • Xu, Z;
  • Denlinger, J;
  • Fedorov, A;
  • Yang, H;
  • Duan, W;
  • Yao, H;
  • Wu, Y;
  • Fan, S;
  • Zhang, H;
  • Chen, X;
  • Zhou, S
  • et al.

Published Web Location

https://doi.org/10.1038/nphys3871
Abstract

Weyl semimetal is a new quantum state of matter hosting the condensed matter physics counterpart of the relativistic Weyl fermions originally introduced in high-energy physics. The Weyl semimetal phase realized in the TaAs class of materials features multiple Fermi arcs arising from topological surface states and exhibits novel quantum phenomena, such as a chiral anomaly-induced negative magnetoresistance and possibly emergent supersymmetry. Recently it was proposed theoretically that a new type (type-II) of Weyl fermion that arises due to the breaking of Lorentz invariance, which does not have a counterpart in high-energy physics, can emerge as topologically protected touching between electron and hole pockets. Here, we report direct experimental evidence of topological Fermi arcs in the predicted type-II Weyl semimetal MoTe 2 (refs 23-25). The topological surface states are confirmed by directly observing the surface states using bulk- and surface-sensitive angle-resolved photoemission spectroscopy, and the quasi-particle interference pattern between the putative topological Fermi arcs in scanning tunnelling microscopy. By establishing MoTe 2 as an experimental realization of a type-II Weyl semimetal, our work opens up opportunities for probing the physical properties of this exciting new state.

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