Spectroscopic evidence for a type II Weyl semimetallic state in MoTe2

Huang, Lunan; McCormick, Timothy M.; Ochi, Masayuki; Zhao, Zhiying; Suzuki, Michi -To; Arita, Ryotaro; Wu, Yun; Mou, Daixiang; Cao, Huibo; Yan, Jiaqiang; Trivedi, Nandini; Kaminski, Adam

doi:10.1038/nmat4685

Title: Spectroscopic evidence for a type II Weyl semimetallic state in MoTe₂

Journal Article · Mon Jul 11 00:00:00 EDT 2016 · Nature Materials

DOI:https://doi.org/10.1038/nmat4685· OSTI ID:1278751

Huang, Lunan ^[1]; McCormick, Timothy M. ^[2]; Ochi, Masayuki ^[3]; Zhao, Zhiying ^[4]; Suzuki, Michi -To ^[5]; Arita, Ryotaro ^[6]; Wu, Yun ^[1];

^[1]; Cao, Huibo ^[7]; Yan, Jiaqiang ^[8]; Trivedi, Nandini ^[2]; Kaminski, Adam ^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States)
The Ohio State Univ., Columbus, OH (United States)
Osaka Univ., Osaka (Japan)
Univ. of Tennessee, Knoxville, TN (United States)
RIKEN Center for Emergent Matter Science (CEMS), Saitama (Japan)
RIKEN Center for Emergent Matter Science (CEMS), Saitama (Japan); Tohoku Univ., Miyagi (Japan)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

In a type I Dirac or Weyl semimetal, the low-energy states are squeezed to a single point in momentum space when the chemical potential μ is tuned precisely to the Dirac/Weyl point. Recently, a type II Weyl semimetal was predicted to exist, where the Weyl states connect hole and electron bands, separated by an indirect gap. This leads to unusual energy states, where hole and electron pockets touch at the Weyl point. In this paper, we present the discovery of a type II topological Weyl semimetal state in pure MoTe₂, where two sets of Weyl points (W^±₂ , W^±₃) exist at the touching points of electron and hole pockets and are located at different binding energies above E_F. Using angle-resolved photoemission spectroscopy, modelling, density functional theory and calculations of Berry curvature, we identify the Weyl points and demonstrate that they are connected by different sets of Fermi arcs for each of the two surface terminations. We also find new surface ‘track states’ that form closed loops and are unique to type II Weyl semimetals. Lastly, this material provides an exciting, new platform to study the properties of Weyl fermions.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Ames Lab. and Iowa State Univ., Ames, IA (United States); RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan); The Ohio State Univ., Columbus, OH (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Simons Foundation (United States)

Contributing Organization:: Osaka Univ. (Japan); Univ. of Tennessee, Knoxville, TN (United States); Tohoku Univ., Sendai (Japan)

Grant/Contract Number:: AC02-07CH11358; DMR-1420451; NSF-DMR-1309461; 343227

OSTI ID:: 1278751

Alternate ID(s):: OSTI ID: 1338564

Report Number(s):: IS-J-9004; nmat4685

Journal Information:: Nature Materials, Vol. 15, Issue 11; ISSN 1476-1122

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 401 works

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Title: Spectroscopic evidence for a type II Weyl semimetallic state in MoTe₂