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Title: Discovery of a new type of topological Weyl fermion semimetal state in Mo xW 1-xTe 2

Abstract

Here, the recent discovery of a Weyl semimetal in TaAs offers the first Weyl fermion observed in nature and dramatically broadens the classification of topological phases. However, in TaAs it has proven challenging to study the rich transport phenomena arising from emergent Weyl fermions. The series Mo xW 1-xTe 2 are inversion-breaking, layered, tunable semimetals already under study as a promising platform for new electronics and recently proposed to host Type II, or strongly Lorentz-violating, Weyl fermions. Here we report the discovery of a Weyl semimetal in Mo xW 1-xTe 2 at x=25%. We use pump-probe angle-resolved photoemission spectroscopy (pump-probe ARPES) to directly observe a topological Fermi arc above the Fermi level, demonstrating a Weyl semimetal. The excellent agreement with calculation suggests that Mo xW 1-xTe 2 is a Type II Weyl semimetal. We also find that certain Weyl points are at the Fermi level, making Mo xW 1-xTe 2 a promising platform for transport and optics experiments on Weyl semimetals.

Authors:
 [1];  [1];  [2];  [3];  [4];  [1]; ORCiD logo [5];  [6]; ORCiD logo [1];  [1];  [1];  [7]; ORCiD logo [5];  [5];  [3];  [3];  [3];  [5]; ORCiD logo [5];  [8] more »;  [2];  [5];  [9];  [3];  [2];  [1] « less
  1. Princeton Univ., Princeton, NJ (United States)
  2. Univ. of Tokyo, Chiba (Japan)
  3. Nanjing Univ., Nanjing (China)
  4. Nanyang Technological Univ. (Singapore)
  5. National Univ. of Singapore (Singapore)
  6. National Tsing Hua Univ., Hsinchu (Taiwan)
  7. Univ. of Central Florida, Orlando, FL (United States)
  8. National Tsing Hua Univ., Hsinchu (Taiwan); Academia Sinica, Taipei (Taiwan)
  9. Nanyang Technological Univ. (Singapore); CINTRA CNRS/NTU/THALES (Singapore)
Publication Date:
Research Org.:
Princeton Univ., NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1361396
Grant/Contract Number:  
FG02-05ER46200
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 36 MATERIALS SCIENCE; electronic properties and materials; topological insulators

Citation Formats

Belopolski, Ilya, Sanchez, Daniel S., Ishida, Yukiaki, Pan, Xingchen, Yu, Peng, Xu, Su -Yang, Chang, Guoqing, Chang, Tay -Rong, Zheng, Hao, Alidoust, Nasser, Bian, Guang, Neupane, Madhab, Huang, Shin -Ming, Lee, Chi -Cheng, Song, You, Bu, Haijun, Wang, Guanghou, Li, Shisheng, Eda, Goki, Jeng, Horng -Tay, Kondo, Takeshi, Lin, Hsin, Liu, Zheng, Song, Fengqi, Shin, Shik, and Hasan, M. Zahid. Discovery of a new type of topological Weyl fermion semimetal state in MoxW1-xTe2. United States: N. p., 2016. Web. doi:10.1038/ncomms13643.
Belopolski, Ilya, Sanchez, Daniel S., Ishida, Yukiaki, Pan, Xingchen, Yu, Peng, Xu, Su -Yang, Chang, Guoqing, Chang, Tay -Rong, Zheng, Hao, Alidoust, Nasser, Bian, Guang, Neupane, Madhab, Huang, Shin -Ming, Lee, Chi -Cheng, Song, You, Bu, Haijun, Wang, Guanghou, Li, Shisheng, Eda, Goki, Jeng, Horng -Tay, Kondo, Takeshi, Lin, Hsin, Liu, Zheng, Song, Fengqi, Shin, Shik, & Hasan, M. Zahid. Discovery of a new type of topological Weyl fermion semimetal state in MoxW1-xTe2. United States. doi:10.1038/ncomms13643.
Belopolski, Ilya, Sanchez, Daniel S., Ishida, Yukiaki, Pan, Xingchen, Yu, Peng, Xu, Su -Yang, Chang, Guoqing, Chang, Tay -Rong, Zheng, Hao, Alidoust, Nasser, Bian, Guang, Neupane, Madhab, Huang, Shin -Ming, Lee, Chi -Cheng, Song, You, Bu, Haijun, Wang, Guanghou, Li, Shisheng, Eda, Goki, Jeng, Horng -Tay, Kondo, Takeshi, Lin, Hsin, Liu, Zheng, Song, Fengqi, Shin, Shik, and Hasan, M. Zahid. Mon . "Discovery of a new type of topological Weyl fermion semimetal state in MoxW1-xTe2". United States. doi:10.1038/ncomms13643. https://www.osti.gov/servlets/purl/1361396.
@article{osti_1361396,
title = {Discovery of a new type of topological Weyl fermion semimetal state in MoxW1-xTe2},
author = {Belopolski, Ilya and Sanchez, Daniel S. and Ishida, Yukiaki and Pan, Xingchen and Yu, Peng and Xu, Su -Yang and Chang, Guoqing and Chang, Tay -Rong and Zheng, Hao and Alidoust, Nasser and Bian, Guang and Neupane, Madhab and Huang, Shin -Ming and Lee, Chi -Cheng and Song, You and Bu, Haijun and Wang, Guanghou and Li, Shisheng and Eda, Goki and Jeng, Horng -Tay and Kondo, Takeshi and Lin, Hsin and Liu, Zheng and Song, Fengqi and Shin, Shik and Hasan, M. Zahid},
abstractNote = {Here, the recent discovery of a Weyl semimetal in TaAs offers the first Weyl fermion observed in nature and dramatically broadens the classification of topological phases. However, in TaAs it has proven challenging to study the rich transport phenomena arising from emergent Weyl fermions. The series MoxW1-xTe2 are inversion-breaking, layered, tunable semimetals already under study as a promising platform for new electronics and recently proposed to host Type II, or strongly Lorentz-violating, Weyl fermions. Here we report the discovery of a Weyl semimetal in MoxW1-xTe2 at x=25%. We use pump-probe angle-resolved photoemission spectroscopy (pump-probe ARPES) to directly observe a topological Fermi arc above the Fermi level, demonstrating a Weyl semimetal. The excellent agreement with calculation suggests that MoxW1-xTe2 is a Type II Weyl semimetal. We also find that certain Weyl points are at the Fermi level, making MoxW1-xTe2 a promising platform for transport and optics experiments on Weyl semimetals.},
doi = {10.1038/ncomms13643},
journal = {Nature Communications},
issn = {2041-1723},
number = ,
volume = 7,
place = {United States},
year = {2016},
month = {12}
}

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Works referenced in this record:

Discovery of a Weyl fermion semimetal and topological Fermi arcs
journal, July 2015


Experimental observation of Weyl points
journal, July 2015


A Weyl Fermion semimetal with surface Fermi arcs in the transition metal monopnictide TaAs class
journal, June 2015

  • Huang, Shin-Ming; Xu, Su-Yang; Belopolski, Ilya
  • Nature Communications, Vol. 6, Issue 1
  • DOI: 10.1038/ncomms8373

Elektron und Gravitation. I
journal, May 1929


Accidental Degeneracy in the Energy Bands of Crystals
journal, August 1937


Some properties of gapless semiconductors of the second kind
journal, August 1971

  • Abrikosov, A. A.; Beneslavskii, S. D.
  • Journal of Low Temperature Physics, Vol. 5, Issue 2
  • DOI: 10.1007/BF00629569

The Adler-Bell-Jackiw anomaly and Weyl fermions in a crystal
journal, November 1983


Weyl Semimetal in a Topological Insulator Multilayer
journal, September 2011


Topological semimetal and Fermi-arc surface states in the electronic structure of pyrochlore iridates
journal, May 2011


Recent developments in transport phenomena in Weyl semimetals
journal, November 2013


Quantum oscillations from surface Fermi arcs in Weyl and Dirac semimetals
journal, October 2014

  • Potter, Andrew C.; Kimchi, Itamar; Vishwanath, Ashvin
  • Nature Communications, Vol. 5, Issue 1
  • DOI: 10.1038/ncomms6161

Signatures of the Adler–Bell–Jackiw chiral anomaly in a Weyl fermion semimetal
journal, February 2016

  • Zhang, Cheng-Long; Xu, Su-Yang; Belopolski, Ilya
  • Nature Communications, Vol. 7, Issue 1
  • DOI: 10.1038/ncomms10735

Extremely large magnetoresistance and ultrahigh mobility in the topological Weyl semimetal candidate NbP
journal, June 2015

  • Shekhar, Chandra; Nayak, Ajaya K.; Sun, Yan
  • Nature Physics, Vol. 11, Issue 8
  • DOI: 10.1038/nphys3372

Prediction of an arc-tunable Weyl Fermion metallic state in MoxW1−xTe2
journal, February 2016

  • Chang, Tay-Rong; Xu, Su-Yang; Chang, Guoqing
  • Nature Communications, Vol. 7, Issue 1
  • DOI: 10.1038/ncomms10639

Type-II Weyl semimetals
journal, November 2015

  • Soluyanov, Alexey A.; Gresch, Dominik; Wang, Zhijun
  • Nature, Vol. 527, Issue 7579
  • DOI: 10.1038/nature15768

MoTe 2 : A Type-II Weyl Topological Metal
journal, July 2016


Prediction of Weyl semimetal in orthorhombic MoTe 2
journal, October 2015


Photonics and optoelectronics of 2D semiconductor transition metal dichalcogenides
journal, March 2016


Quantum spin Hall effect in two-dimensional transition metal dichalcogenides
journal, November 2014


Phase patterning for ohmic homojunction contact in MoTe2
journal, August 2015


Atomically Thin MoS2 A New Direct-Gap Semiconductor
journal, September 2010


Valley-selective circular dichroism of monolayer molybdenum disulphide
journal, January 2012

  • Cao, Ting; Wang, Gang; Han, Wenpeng
  • Nature Communications, Vol. 3, Issue 1
  • DOI: 10.1038/ncomms1882

Consequences of a condensed matter realization of Lorentz-violating QED in Weyl semi-metals
journal, August 2012


Topology and Interactions in a Frustrated Slab: Tuning from Weyl Semimetals to C > 1 Fractional Chern Insulators
journal, January 2015


Quantum transport in Dirac materials: Signatures of tilted and anisotropic Dirac and Weyl cones
journal, March 2015


A strongly robust type II Weyl fermion semimetal state in Ta 3 S 2
journal, June 2016

  • Chang, Guoqing; Xu, Su-Yang; Sanchez, Daniel S.
  • Science Advances, Vol. 2, Issue 6
  • DOI: 10.1126/sciadv.1600295

TaIrTe 4 : A ternary type-II Weyl semimetal
journal, May 2016


Robust Type-II Weyl Semimetal Phase in Transition Metal Diphosphides X P 2 ( X = Mo , W)
journal, August 2016


Intrinsic anomalous Hall effect in type-II Weyl semimetals
journal, June 2016


Coulomb Interaction Effect in Weyl Fermions with Tilted Energy Dispersion in Two Dimensions
journal, March 2016


Fermi arc electronic structure and Chern numbers in the type-II Weyl semimetal candidate Mo x W 1 x Te 2
journal, August 2016


Criteria for Directly Detecting Topological Fermi Arcs in Weyl Semimetals
journal, February 2016


The crystal structures of WTe 2 and high-temperature MoTe 2
journal, February 1966


Spectroscopic evidence for a type II Weyl semimetallic state in MoTe2
journal, July 2016

  • Huang, Lunan; McCormick, Timothy M.; Ochi, Masayuki
  • Nature Materials, Vol. 15, Issue 11
  • DOI: 10.1038/nmat4685

Experimental observation of topological Fermi arcs in type-II Weyl semimetal MoTe2
journal, September 2016

  • Deng, Ke; Wan, Guoliang; Deng, Peng
  • Nature Physics, Vol. 12, Issue 12
  • DOI: 10.1038/nphys3871

Observation of Fermi arcs in the type-II Weyl semimetal candidate WTe 2
journal, September 2016


Observation of large topologically trivial Fermi arcs in the candidate type-II Weyl semimetal WT e 2
journal, September 2016


Time-resolved photoemission apparatus achieving sub-20-meV energy resolution and high stability
journal, December 2014

  • Ishida, Y.; Togashi, T.; Yamamoto, K.
  • Review of Scientific Instruments, Vol. 85, Issue 12
  • DOI: 10.1063/1.4903788

Generalized Gradient Approximation Made Simple
journal, October 1996

  • Perdew, John P.; Burke, Kieron; Ernzerhof, Matthias
  • Physical Review Letters, Vol. 77, Issue 18, p. 3865-3868
  • DOI: 10.1103/PhysRevLett.77.3865

Projector augmented-wave method
journal, December 1994


From ultrasoft pseudopotentials to the projector augmented-wave method
journal, January 1999


Efficiency of ab-initio total energy calculations for metals and semiconductors using a plane-wave basis set
journal, July 1996


Metal-metal vs tellurium-tellurium bonding in WTe2 and its ternary variants TaIrTe4 and NbIrTe4
journal, November 1992

  • Mar, Arthur; Jobic, Stephane; Ibers, James A.
  • Journal of the American Chemical Society, Vol. 114, Issue 23
  • DOI: 10.1021/ja00049a029

Maximally localized generalized Wannier functions for composite energy bands
journal, November 1997


Maximally localized Wannier functions for entangled energy bands
journal, December 2001


wannier90: A tool for obtaining maximally-localised Wannier functions
journal, May 2008

  • Mostofi, Arash A.; Yates, Jonathan R.; Lee, Young-Su
  • Computer Physics Communications, Vol. 178, Issue 9
  • DOI: 10.1016/j.cpc.2007.11.016

Observation of a large-gap topological-insulator class with a single Dirac cone on the surface
journal, May 2009

  • Xia, Y.; Qian, D.; Hsieh, D.
  • Nature Physics, Vol. 5, Issue 6, p. 398-402
  • DOI: 10.1038/nphys1274

Topological insulators in Bi2Se3, Bi2Te3 and Sb2Te3 with a single Dirac cone on the surface
journal, May 2009

  • Zhang, Haijun; Liu, Chao-Xing; Qi, Xiao-Liang
  • Nature Physics, Vol. 5, Issue 6, p. 438-442
  • DOI: 10.1038/nphys1270

    Works referencing / citing this record:

    Discovery of Superconductivity in 2M WS 2 with Possible Topological Surface States
    journal, June 2019


    Discovery of Superconductivity in 2M WS 2 with Possible Topological Surface States
    journal, June 2019