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Fermi arc electronic structure and Chern numbers in the type-II Weyl semimetal candidate MoxW1−xTe2
DOI:
10.1103/PhysRevB.94.085127
Authors:
Ilya
Belopolski
(Princeton University)
,
Su-Yang
Xu
(Princeton University)
,
Yukiaki
Ishida
(University of Tokyo)
,
Xingchen
Pan
(Nanjing University)
,
Peng
Yu
(Nanyang Technological University)
,
Daniel S.
Sanchez
(Princeton University)
,
Hao
Zheng
(Princeton University)
,
Madhab
Neupane
(Princeton University)
,
Nasser
Alidoust
(Princeton University)
,
Guoqing
Chang
(University of Singapore)
,
Tay-Rong
Chang
(National Tsing Hua University)
,
Yun
Wu
(Iowa State University)
,
Guang
Bian
(Princeton University)
,
Shin-Ming
Huang
(National University of Singapore; National Sun Yat-sen University)
,
Chi-Cheng
Lee
(National University of Singapore)
,
Daixiang
Mou
(Iowa State University)
,
Lunan
Huang
(Iowa State University)
,
You
Song
(Nanjing University)
,
Baigeng
Wang
(Nanjing University)
,
Guanghou
Wang
(Nanjing University)
,
Yao-Wen
Yeh
(Princeton University)
,
Nan
Yao
(Princeton University)
,
Julien E.
Rault
(Synchrotron SOLEIL)
,
Patrick
Le Fèvre
(Synchrotron SOLEIL)
,
François
Bertran
(Synchrotron SOLEIL)
,
Horng-Tay
Jeng
(National Tsing Hua University; Institute of Physics, Academia Sinica)
,
Takeshi
Kondo
(University of Tokyo)
,
Adam
Kaminski
(Iowa State University)
,
Hsin
Lin
(National University of Singapore)
,
Zheng
Liu
(Nanyang Technological University)
,
Fengqi
Song
(Nanjing University)
,
Shik
Shin
(University of Tokyo)
,
M. Zahid
Hasan
(Princeton University)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Physical Review B
, VOL 94
State:
Published (Approved)
Published:
August 2016
Diamond Proposal Number(s):
13653
Abstract: 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 MoxW1−xTe2 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 ɛF to show a Weyl semimetal in MoxW1−xTe2. Then, we study MoxW1−xTe2 by pump-probe ARPES and we directly access the band structure >0.2 eV above ɛF 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 MoxW1−xTe2 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 MoxW1−xTe2.
Journal Keywords: Topological phases of matter; Weyl fermions; Topological materials; Transition-metal dichalcogenide; Weyl semimetal; Angle-resolved photoemission spectroscopy
Subject Areas:
Physics,
Materials
Instruments:
I05-ARPES
Added On:
22/10/2017 16:38
Discipline Tags:
Quantum Materials
Physics
Hard condensed matter - structures
Materials Science
Technical Tags:
Spectroscopy
Angle Resolved Photoemission Spectroscopy (ARPES)