Fermi arc electronic structure and Chern numbers in the typeII Weyl semimetal candidate ${\mathrm{Mo}}_{x}{\mathrm{W}}_{1x}{\mathrm{Te}}_{2}$
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 Mo _{x} W _{1  x} Te _{2} may realize such a typeII 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} by pumpprobe 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 pumpprobe ARPES may directly pinpoint the Fermi arc. Our work sets the stage for the experimental discovery of the first typeII Weyl semimetal in Mo _{x} W _{1  x} Te _{2} .
 Authors:
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 Publication Date:
 Research Org.:
 Ames Laboratory (AMES), Ames, IA (United States)
 Sponsoring Org.:
 USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC22)
 OSTI Identifier:
 1342950
 Report Number(s):
 ISJ 8989
Journal ID: ISSN 24699950; PRBMDO
 DOE Contract Number:
 FG0205ER46200; 26800165; AC0207CH11358; 91421109; 11522432; 21571097; BK20130054; NRFRF201308; NRFNRFF201303; M4081137.070
 Resource Type:
 Journal Article
 Resource Relation:
 Journal Name: Physical Review B; Journal Volume: 94; Journal Issue: 8
 Country of Publication:
 United States
 Language:
 English
 Subject:
 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Belopolski, Ilya, Xu, SuYang, Ishida, Yukiaki, Pan, Xingchen, Yu, Peng, Sanchez, Daniel S., Zheng, Hao, Neupane, Madhab, Alidoust, Nasser, Chang, Guoqing, Chang, TayRong, Wu, Yun, Bian, Guang, Huang, ShinMing, Lee, ChiCheng, Mou, Daixiang, Huang, Lunan, Song, You, Wang, Baigeng, Wang, Guanghou, Yeh, YaoWen, Yao, Nan, Rault, Julien E., Le Fèvre, Patrick, Bertran, François, Jeng, HorngTay, Kondo, Takeshi, Kaminski, Adam, Lin, Hsin, Liu, Zheng, Song, Fengqi, Shin, Shik, and Hasan, M. Zahid. Fermi arc electronic structure and Chern numbers in the typeII Weyl semimetal candidate MoxW1xTe2. United States: N. p., 2016.
Web. doi:10.1103/PhysRevB.94.085127.
Belopolski, Ilya, Xu, SuYang, Ishida, Yukiaki, Pan, Xingchen, Yu, Peng, Sanchez, Daniel S., Zheng, Hao, Neupane, Madhab, Alidoust, Nasser, Chang, Guoqing, Chang, TayRong, Wu, Yun, Bian, Guang, Huang, ShinMing, Lee, ChiCheng, Mou, Daixiang, Huang, Lunan, Song, You, Wang, Baigeng, Wang, Guanghou, Yeh, YaoWen, Yao, Nan, Rault, Julien E., Le Fèvre, Patrick, Bertran, François, Jeng, HorngTay, Kondo, Takeshi, Kaminski, Adam, Lin, Hsin, Liu, Zheng, Song, Fengqi, Shin, Shik, & Hasan, M. Zahid. Fermi arc electronic structure and Chern numbers in the typeII Weyl semimetal candidate MoxW1xTe2. United States. doi:10.1103/PhysRevB.94.085127.
Belopolski, Ilya, Xu, SuYang, Ishida, Yukiaki, Pan, Xingchen, Yu, Peng, Sanchez, Daniel S., Zheng, Hao, Neupane, Madhab, Alidoust, Nasser, Chang, Guoqing, Chang, TayRong, Wu, Yun, Bian, Guang, Huang, ShinMing, Lee, ChiCheng, Mou, Daixiang, Huang, Lunan, Song, You, Wang, Baigeng, Wang, Guanghou, Yeh, YaoWen, Yao, Nan, Rault, Julien E., Le Fèvre, Patrick, Bertran, François, Jeng, HorngTay, Kondo, Takeshi, Kaminski, Adam, Lin, Hsin, Liu, Zheng, Song, Fengqi, Shin, Shik, and Hasan, M. Zahid. 2016.
"Fermi arc electronic structure and Chern numbers in the typeII Weyl semimetal candidate MoxW1xTe2". United States.
doi:10.1103/PhysRevB.94.085127.
@article{osti_1342950,
title = {Fermi arc electronic structure and Chern numbers in the typeII Weyl semimetal candidate MoxW1xTe2},
author = {Belopolski, Ilya and Xu, SuYang and Ishida, Yukiaki and Pan, Xingchen and Yu, Peng and Sanchez, Daniel S. and Zheng, Hao and Neupane, Madhab and Alidoust, Nasser and Chang, Guoqing and Chang, TayRong and Wu, Yun and Bian, Guang and Huang, ShinMing and Lee, ChiCheng and Mou, Daixiang and Huang, Lunan and Song, You and Wang, Baigeng and Wang, Guanghou and Yeh, YaoWen and Yao, Nan and Rault, Julien E. and Le Fèvre, Patrick and Bertran, François and Jeng, HorngTay and Kondo, Takeshi and Kaminski, Adam and Lin, Hsin and Liu, Zheng and Song, Fengqi and Shin, Shik and Hasan, M. Zahid},
abstractNote = {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 typeII 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 by pumpprobe 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 pumpprobe ARPES may directly pinpoint the Fermi arc. Our work sets the stage for the experimental discovery of the first typeII Weyl semimetal in Mo x W 1  x Te 2 .},
doi = {10.1103/PhysRevB.94.085127},
journal = {Physical Review B},
number = 8,
volume = 94,
place = {United States},
year = 2016,
month = 8
}

Ternary chalcogenides $\mathrm{C}{\mathrm{s}}_{2}\mathrm{Z}{\mathrm{n}}_{3}\mathrm{S}{\mathrm{e}}_{4}$ and $\mathrm{C}{\mathrm{s}}_{2}\mathrm{Z}{\mathrm{n}}_{3}\mathrm{T}{\mathrm{e}}_{4}$ : Potential $p$ type transparent conducting materials
Here we report prediction of two new ternary chalcogenides that can potentially be used as ptype transparent conductors along with experimental synthesis and initial characterization of these previously unknown compounds, Cs _{2}Zn _{3}Ch _{4} (Ch = Se, Te). In particular, the structures are predicted based on density functional calculations and confirmed by experiments. Phase diagrams, electronic structure, optical properties, and defect properties of Cs _{2}Zn _{3}Se _{4} and Cs _{2}Zn _{3}Te _{4} are calculated to assess the viability of these materials as ptype TCMs. Cs _{2}Zn _{3}Se _{4} and Cs _{2}Zn _{3}Te _{4}, which are stable under ambient air, displaymore »Cited by 3