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Title: Electronic structure of monolayer 1T'-MoTe2 grown by molecular beam epitaxy

Abstract

Monolayer transition metal dichalcogenides (TMDCs) in the 1T' structural phase have drawn a great deal of attention due to the prediction of quantum spin Hall insulator states. The band inversion and the concomitant changes in the band topology induced by the structural distortion from 1T to 1T' phases are well established. However, the bandgap opening due to the strong spin-orbit coupling (SOC) is only verified for 1T'-WTe2 recently and still debated for other TMDCs. Here we report a successful growth of high-quality monolayer 1T'-MoTe2 on a bilayer graphene substrate through molecular beam epitaxy. Using in situ angle-resolved photoemission spectroscopy (ARPES), we have investigated the low-energy electronic structure and Fermi surface topology. The SOC-induced breaking of the band degeneracy points between the valence and conduction bands is clearly observed by ARPES. However, the strength of SOC is found to be insufficient to open a bandgap, which makes monolayer 1T'-MoTe2 on bilayer graphene a semimetal.

Authors:
 [1];  [2];  [3];  [4]; ORCiD logo [5];  [6];  [6];  [7];  [3];  [3]; ORCiD logo [8]
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  1. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Chinese Academy of Sciences, Shanghai (China); Shanghai Tech Univ., Shanghai (China)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States); National Univ. of Defense Technology, Changsha (China)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Max Planck-POSTECH/Hsinch Center for Complex Phase Materials, Gyeongbuk (South Korea)
  5. Pusan National Univ., Busan (South Korea)
  6. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  7. Chinese Academy of Sciences, Shanghai (China); Shanghai Tech Univ., Shanghai (China)
  8. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1437578
Alternate Identifier(s):
OSTI ID: 1421017; OSTI ID: 1435115
Grant/Contract Number:  
FA9550-14-1-0277; AC02-76SF00515; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
APL Materials
Additional Journal Information:
Journal Volume: 6; Journal Issue: 2; Journal ID: ISSN 2166-532X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Tang, Shujie, Zhang, Chaofan, Jia, Chunjing, Ryu, Hyejin, Hwang, Choongyu, Hashimoto, Makoto, Lu, Donghui, Liu, Zhi, Devereaux, Thomas P., Shen, Zhi-Xun, and Mo, Sung-Kwan. Electronic structure of monolayer 1T'-MoTe2 grown by molecular beam epitaxy. United States: N. p., 2017. Web. doi:10.1063/1.5004700.
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Tang, Shujie, Zhang, Chaofan, Jia, Chunjing, Ryu, Hyejin, Hwang, Choongyu, Hashimoto, Makoto, Lu, Donghui, Liu, Zhi, Devereaux, Thomas P., Shen, Zhi-Xun, & Mo, Sung-Kwan. Electronic structure of monolayer 1T'-MoTe2 grown by molecular beam epitaxy. United States. https://doi.org/10.1063/1.5004700
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Tang, Shujie, Zhang, Chaofan, Jia, Chunjing, Ryu, Hyejin, Hwang, Choongyu, Hashimoto, Makoto, Lu, Donghui, Liu, Zhi, Devereaux, Thomas P., Shen, Zhi-Xun, and Mo, Sung-Kwan. Tue . "Electronic structure of monolayer 1T'-MoTe2 grown by molecular beam epitaxy". United States. https://doi.org/10.1063/1.5004700. https://www.osti.gov/servlets/purl/1437578.
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@article{osti_1437578,
title = {Electronic structure of monolayer 1T'-MoTe2 grown by molecular beam epitaxy},
author = {Tang, Shujie and Zhang, Chaofan and Jia, Chunjing and Ryu, Hyejin and Hwang, Choongyu and Hashimoto, Makoto and Lu, Donghui and Liu, Zhi and Devereaux, Thomas P. and Shen, Zhi-Xun and Mo, Sung-Kwan},
abstractNote = {Monolayer transition metal dichalcogenides (TMDCs) in the 1T' structural phase have drawn a great deal of attention due to the prediction of quantum spin Hall insulator states. The band inversion and the concomitant changes in the band topology induced by the structural distortion from 1T to 1T' phases are well established. However, the bandgap opening due to the strong spin-orbit coupling (SOC) is only verified for 1T'-WTe2 recently and still debated for other TMDCs. Here we report a successful growth of high-quality monolayer 1T'-MoTe2 on a bilayer graphene substrate through molecular beam epitaxy. Using in situ angle-resolved photoemission spectroscopy (ARPES), we have investigated the low-energy electronic structure and Fermi surface topology. The SOC-induced breaking of the band degeneracy points between the valence and conduction bands is clearly observed by ARPES. However, the strength of SOC is found to be insufficient to open a bandgap, which makes monolayer 1T'-MoTe2 on bilayer graphene a semimetal.},
doi = {10.1063/1.5004700},
journal = {APL Materials},
number = 2,
volume = 6,
place = {United States},
year = {2017},
month = {11}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1063/1.5004700
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Cited by: 34 works
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Figures / Tables:

TABLE I TABLE I: Gap sizes derived from different calculation methods and experimental measurements.
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Works referenced in this record:

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journal, August 2017

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Bandgap opening in few-layered monoclinic MoTe2
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Universal Mechanism of Band-Gap Engineering in Transition-Metal Dichalcogenides
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Fermi Arcs and Their Topological Character in the Candidate Type-II Weyl Semimetal MoTe 2
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Monolayer Single-Crystal 1T′-MoTe 2 Grown by Chemical Vapor Deposition Exhibits Weak Antilocalization Effect
journal, June 2016

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    Works referencing / citing this record:

    Substrate temperature dependence of the crystalline quality for the synthesis of pure-phase MoTe 2 on graphene/6 H -SiC(0001) by molecular beam epitaxy
    journal, December 2019

    Mechanical characterization of phase-changed single-layer MoS 2 sheets
    journal, February 2019

    Experimental progress on layered topological semimetals
    journal, April 2019

    Thickness dependent electronic structure of exfoliated mono- and few-layer 1 T ′ − MoTe 2
    journal, October 2018

    Experimental Progress on Layered Topological Semimetals
    text, January 2019

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      Figures / Tables found in this record:

      TABLE I (p. 2)table
      FIG. 1 (p. 3)figure
      FIG. 2 (p. 3)figure
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      FIG. 4 (p. 5)figure
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