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Title: Observation of Fermi arcs in the type-II Weyl semimetal candidate WTe 2

We use ultrahigh resolution, tunable, vacuum ultraviolet laser angle-resolved photoemission spectroscopy (ARPES) to study the electronic properties of WTe 2, a material that was predicted to be a type-II Weyl semimetal. The Weyl fermion states in WTe 2 were proposed to emerge at the crossing points of electron and hole pockets, and Fermi arcs connecting electron and hole pockets would be visible in the spectral function on (001) surface. Here we report the observation of such Fermi arcs in WTe 2 confirming the theoretical predictions. This provides strong evidence for type-II Weyl semimetallic states in WTe 2. Here, we also find that trivial and topological domains coexist on the same surface of the sample due to the presence of inhomogeneous strain detected by scanning electron microscopy data. This is in agreement with the theoretical prediction that strain can drive this system from topological Weyl to trivial semimetal. WTe 2 therefore provides a tunable playground for studying exotic topological quantum effects.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
Publication Date:
Report Number(s):
IS-J-9102
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:
AC02-07CH11358; GBMF4411; DMR-1420451
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 12; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1337678
Alternate Identifier(s):
OSTI ID: 1324490

Wu, Yun, Mou, Daixiang, Jo, Na Hyun, Sun, Kewei, Huang, Lunan, Bud'ko, S. L., Canfield, P. C., and Kaminski, Adam. Observation of Fermi arcs in the type-II Weyl semimetal candidate WTe2. United States: N. p., Web. doi:10.1103/PhysRevB.94.121113.
Wu, Yun, Mou, Daixiang, Jo, Na Hyun, Sun, Kewei, Huang, Lunan, Bud'ko, S. L., Canfield, P. C., & Kaminski, Adam. Observation of Fermi arcs in the type-II Weyl semimetal candidate WTe2. United States. doi:10.1103/PhysRevB.94.121113.
Wu, Yun, Mou, Daixiang, Jo, Na Hyun, Sun, Kewei, Huang, Lunan, Bud'ko, S. L., Canfield, P. C., and Kaminski, Adam. 2016. "Observation of Fermi arcs in the type-II Weyl semimetal candidate WTe2". United States. doi:10.1103/PhysRevB.94.121113. https://www.osti.gov/servlets/purl/1337678.
@article{osti_1337678,
title = {Observation of Fermi arcs in the type-II Weyl semimetal candidate WTe2},
author = {Wu, Yun and Mou, Daixiang and Jo, Na Hyun and Sun, Kewei and Huang, Lunan and Bud'ko, S. L. and Canfield, P. C. and Kaminski, Adam},
abstractNote = {We use ultrahigh resolution, tunable, vacuum ultraviolet laser angle-resolved photoemission spectroscopy (ARPES) to study the electronic properties of WTe2, a material that was predicted to be a type-II Weyl semimetal. The Weyl fermion states in WTe2 were proposed to emerge at the crossing points of electron and hole pockets, and Fermi arcs connecting electron and hole pockets would be visible in the spectral function on (001) surface. Here we report the observation of such Fermi arcs in WTe2 confirming the theoretical predictions. This provides strong evidence for type-II Weyl semimetallic states in WTe2. Here, we also find that trivial and topological domains coexist on the same surface of the sample due to the presence of inhomogeneous strain detected by scanning electron microscopy data. This is in agreement with the theoretical prediction that strain can drive this system from topological Weyl to trivial semimetal. WTe2 therefore provides a tunable playground for studying exotic topological quantum effects.},
doi = {10.1103/PhysRevB.94.121113},
journal = {Physical Review B},
number = 12,
volume = 94,
place = {United States},
year = {2016},
month = {9}
}

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