Discovery of a new type of topological Weyl fermion semimetal state in MoxW1-xTe2

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

doi:10.1038/ncomms13643

Title: Discovery of a new type of topological Weyl fermion semimetal state in Mo_xW_1-xTe₂

Journal Article · Mon Dec 05 00:00:00 EST 2016 · Nature Communications

DOI:https://doi.org/10.1038/ncomms13643· OSTI ID:1361396

Belopolski, Ilya ^[1]; Sanchez, Daniel S. ^[1]; Ishida, Yukiaki ^[2]; Pan, Xingchen ^[3]; Yu, Peng ^[4]; Xu, Su -Yang ^[1];

^[5]; Chang, Tay -Rong ^[6];

^[1]; Alidoust, Nasser ^[1]; Bian, Guang ^[1]; Neupane, Madhab ^[7];

^[5]; Lee, Chi -Cheng ^[5]; Song, You ^[3]; Bu, Haijun ^[3]; Wang, Guanghou ^[3]; Li, Shisheng ^[5];

^[5]; Jeng, Horng -Tay ^[8] more »

Princeton Univ., Princeton, NJ (United States)
Univ. of Tokyo, Chiba (Japan)
Nanjing Univ., Nanjing (China)
Nanyang Technological Univ. (Singapore)
National Univ. of Singapore (Singapore)
National Tsing Hua Univ., Hsinchu (Taiwan)
Univ. of Central Florida, Orlando, FL (United States)
National Tsing Hua Univ., Hsinchu (Taiwan); Academia Sinica, Taipei (Taiwan)
Nanyang Technological Univ. (Singapore); CINTRA CNRS/NTU/THALES (Singapore)

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-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 Mo_xW_1-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 Mo_xW_1-xTe₂ is a Type II Weyl semimetal. We also find that certain Weyl points are at the Fermi level, making Mo_xW_1-xTe₂ a promising platform for transport and optics experiments on Weyl semimetals.

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Research Organization:: Princeton Univ., NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-05ER46200

OSTI ID:: 1361396

Journal Information:: Nature Communications, Vol. 7; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 145 works

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Title: Discovery of a new type of topological Weyl fermion semimetal state in Mo_xW_1-xTe₂