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

Abstract

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 EF. 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.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [1]; ORCiD logo [1];  [7];  [8];  [2];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  2. The Ohio State Univ., Columbus, OH (United States)
  3. Osaka Univ., Osaka (Japan)
  4. Univ. of Tennessee, Knoxville, TN (United States)
  5. RIKEN Center for Emergent Matter Science (CEMS), Saitama (Japan)
  6. RIKEN Center for Emergent Matter Science (CEMS), Saitama (Japan); Tohoku Univ., Miyagi (Japan)
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  8. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Ames Lab., Ames, IA (United States); Oak Ridge National Lab. (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 Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Simons Foundation (United States)
Contributing Org.:
Osaka Univ. (Japan); Univ. of Tennessee, Knoxville, TN (United States); Tohoku Univ., Sendai (Japan)
OSTI Identifier:
1278751
Alternate Identifier(s):
OSTI ID: 1338564
Report Number(s):
IS-J-9004
Journal ID: ISSN 1476-1122; nmat4685
Grant/Contract Number:  
AC02-07CH11358; DMR-1420451; NSF-DMR-1309461; 343227
Resource Type:
Accepted Manuscript
Journal Name:
Nature Materials
Additional Journal Information:
Journal Volume: 15; Journal Issue: 11; Journal ID: ISSN 1476-1122
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; topological insulators

Citation Formats

Huang, Lunan, McCormick, Timothy M., Ochi, Masayuki, Zhao, Zhiying, Suzuki, Michi -To, Arita, Ryotaro, Wu, Yun, Mou, Daixiang, Cao, Huibo, Yan, Jiaqiang, Trivedi, Nandini, and Kaminski, Adam. Spectroscopic evidence for a type II Weyl semimetallic state in MoTe2. United States: N. p., 2016. Web. doi:10.1038/nmat4685.
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. Spectroscopic evidence for a type II Weyl semimetallic state in MoTe2. United States. https://doi.org/10.1038/nmat4685
Huang, Lunan, McCormick, Timothy M., Ochi, Masayuki, Zhao, Zhiying, Suzuki, Michi -To, Arita, Ryotaro, Wu, Yun, Mou, Daixiang, Cao, Huibo, Yan, Jiaqiang, Trivedi, Nandini, and Kaminski, Adam. Mon . "Spectroscopic evidence for a type II Weyl semimetallic state in MoTe2". United States. https://doi.org/10.1038/nmat4685. https://www.osti.gov/servlets/purl/1278751.
@article{osti_1278751,
title = {Spectroscopic evidence for a type II Weyl semimetallic state in MoTe2},
author = {Huang, Lunan and McCormick, Timothy M. and Ochi, Masayuki and Zhao, Zhiying and Suzuki, Michi -To and Arita, Ryotaro and Wu, Yun and Mou, Daixiang and Cao, Huibo and Yan, Jiaqiang and Trivedi, Nandini and Kaminski, Adam},
abstractNote = {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 EF. 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.},
doi = {10.1038/nmat4685},
journal = {Nature Materials},
number = 11,
volume = 15,
place = {United States},
year = {2016},
month = {7}
}

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journal, April 2018


Phase-Engineered Weyl Semi-Metallic Mo x W 1-x Te 2 Nanosheets as a Highly Efficient Electrocatalyst for Dye-Sensitized Solar Cells
journal, January 2019

  • Hudie, Shemsia Mohammed; Lee, Chuan-Pei; Mathew, Roshan Jesus
  • Solar RRL, Vol. 3, Issue 3
  • DOI: 10.1002/solr.201800314

Recent advances in ternary two-dimensional materials: synthesis, properties and applications
journal, January 2017

  • Wang, Lina; Hu, Peng; Long, Yi
  • Journal of Materials Chemistry A, Vol. 5, Issue 44
  • DOI: 10.1039/c7ta06971e

Stabilization of a monolayer tellurene phase at CdTe interfaces
journal, January 2019

  • Paulauskas, Tadas; Sen, Fatih G.; Sun, Ce
  • Nanoscale, Vol. 11, Issue 31
  • DOI: 10.1039/c9nr02342a

Magneto-conductivity of tilted type-I Weyl semimetals with different types of impurities
journal, April 2019


Few-layer 1T′ MoTe 2 as gapless semimetal with thickness dependent carrier transport
journal, June 2018


Disorder and magnetoconductivity in tilted Weyl semimetals
journal, February 2020


Observation of spin-polarized bands and domain-dependent Fermi arcs in polar Weyl semimetal MoT e 2
journal, March 2017


Quantum oscillation studies of the topological semimetal candidate ZrGe M ( M = S , Se , Te )
journal, May 2017


Experimental evidence for type-II Dirac semimetal in PtSe 2
journal, September 2017


Doping and tilting on optics in noncentrosymmetric multi-Weyl semimetals
journal, January 2018


Saddle-like topological surface states on the T T X family of compounds ( T ,   T = Transition metal, X = Si , Ge)
journal, February 2018


Magnetic properties of type-I and type-II Weyl semimetals in the superconducting state
journal, April 2018


Mechanical control of crystal symmetry and superconductivity in Weyl semimetal MoTe 2
journal, July 2018


Photonic Weyl points due to broken time-reversal symmetry in magnetized semiconductor
journal, August 2019


Nontrivial superconductivity in topological MoTe 2− x S x crystals
journal, August 2018

  • Li, Yanan; Gu, Qiangqiang; Chen, Chen
  • Proceedings of the National Academy of Sciences, Vol. 115, Issue 38
  • DOI: 10.1073/pnas.1801650115

Quantum oscillations and nontrivial topological state in a compensated semimetal TaP 2
journal, September 2019


Universal scattering response across the type-II Weyl semimetal phase diagram
journal, February 2018


Importance of electron correlations in understanding photoelectron spectroscopy and Weyl character of MoTe 2
journal, January 2019


Lorentz-violating type-II Dirac fermions in transition metal dichalcogenide PtTe$_2$
text, January 2016


Electrodynamic response of type II Weyl semimetals
text, January 2016


Superconductivity in Type-II Weyl Semimetals
text, January 2016


Weyl and Dirac Semimetals in Three Dimensional Solids
text, January 2017


Flux growth in a horizontal configuration: an analogue to vapor transport growth
text, January 2017


The semiclassical theory of anomalous transport in type-II topological Weyl semimetals
text, January 2017


Quasiparticle Properties under Interactions in Weyl and Nodal Line Semimetals
text, January 2019


Fragility of Fermi arcs in Dirac semimetals
text, January 2019


Magnetic Weyl Semimetal Phase in a Kagome Crystal
text, January 2019