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Title: Fermi surface of the Weyl type-II metallic candidate WP 2

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1389122
Grant/Contract Number:
SC0002613
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 12; Related Information: CHORUS Timestamp: 2017-09-11 10:51:25; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Schönemann, R., Aryal, N., Zhou, Q., Chiu, Y. -C., Chen, K. -W., Martin, T. J., McCandless, G. T., Chan, J. Y., Manousakis, E., and Balicas, L. Fermi surface of the Weyl type-II metallic candidate WP 2. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.121108.
Schönemann, R., Aryal, N., Zhou, Q., Chiu, Y. -C., Chen, K. -W., Martin, T. J., McCandless, G. T., Chan, J. Y., Manousakis, E., & Balicas, L. Fermi surface of the Weyl type-II metallic candidate WP 2. United States. doi:10.1103/PhysRevB.96.121108.
Schönemann, R., Aryal, N., Zhou, Q., Chiu, Y. -C., Chen, K. -W., Martin, T. J., McCandless, G. T., Chan, J. Y., Manousakis, E., and Balicas, L. 2017. "Fermi surface of the Weyl type-II metallic candidate WP 2". United States. doi:10.1103/PhysRevB.96.121108.
@article{osti_1389122,
title = {Fermi surface of the Weyl type-II metallic candidate WP 2},
author = {Schönemann, R. and Aryal, N. and Zhou, Q. and Chiu, Y. -C. and Chen, K. -W. and Martin, T. J. and McCandless, G. T. and Chan, J. Y. and Manousakis, E. and Balicas, L.},
abstractNote = {},
doi = {10.1103/PhysRevB.96.121108},
journal = {Physical Review B},
number = 12,
volume = 96,
place = {United States},
year = 2017,
month = 9
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on September 11, 2018
Publisher's Accepted Manuscript

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  • Cited by 25
  • It has recently been proposed that electronic band structures in crystals can give rise to a previously overlooked type of Weyl fermion, which violates Lorentz invariance and, consequently, is forbidden in particle physics. It was further predicted that Mo x W 1 - x Te 2 may realize such a type-II Weyl fermion. Here, we first show theoretically that it is crucial to access the band structure above the Fermi level ε F to show a Weyl semimetal in Mo x W 1 - x Te 2 . Then, we study Mo x W 1 - x Te 2 bymore » pump-probe ARPES and we directly access the band structure > 0.2 eV above ε F in experiment. By comparing our results with ab initio calculations, we conclude that we directly observe the surface state containing the topological Fermi arc. We propose that a future study of Mo x W 1 - x Te 2 by pump-probe ARPES may directly pinpoint the Fermi arc. Our work sets the stage for the experimental discovery of the first type-II Weyl semimetal in Mo x W 1 - x Te 2 .« less
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  • 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 alsomore » 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.« less