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Title: Unique Gap Structure and Symmetry of the Charge Density Wave in Single-Layer VSe 2

Abstract

Single layers of transition metal dichalcogenides (TMDCs) are great candidates for electronic applications beyond the graphene platform; many of them exhibit novel properties including charge density waves (CDWs) and magnetic ordering. CDWs in these single layers are typically a planar projection of the corresponding bulk CDWs because of the quasi-two-dimensional nature of TMDCs; a different CDW symmetry is unexpected. We report herein the successful creation of pristine single-layer VSe2, which shows a ($$\sqrt{7}×\sqrt{3}$$) CDW in contrast to the (4×4) CDW for the layers in bulk VSe2. Angle-resolved photoemission spectroscopy from the single layer shows a sizable ($$\sqrt{7}×\sqrt{3}$$) CDW gap of ~100 meV at the zone boundary, a 220 K CDW transition temperature twice the bulk value, and no ferromagnetic exchange splitting as predicted by theory. This robust CDW with an exotic broken symmetry as the ground state is explained via a first-principles analysis. The findings illustrate a unique CDW phenomenon in the two-dimensional limit.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [6];  [7]
  1. Univ. of Illinois at Urbana-Champaign, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. National Taiwan Univ., Taipei (Taiwan)
  3. Academia Sinica, Taipei (Taiwan)
  4. Univ. of Illinois at Urbana-Champaign, IL (United States)
  5. National Taiwan Univ., Taipei (Taiwan); Academia Sinica, Taipei (Taiwan); Georgia Inst. of Technology, Atlanta, GA (United States)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  7. Univ. of Illinois at Urbana-Champaign, IL (United States); National Taiwan Univ., Taipei (Taiwan)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1571123
Alternate Identifier(s):
OSTI ID: 1481451
Grant/Contract Number:  
AC02-05CH11231; FG02-07ER46383
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 121; Journal Issue: 19; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE

Citation Formats

Chen, P., Pai, Woei Wu, Chan, Y. -H., Madhavan, V., Chou, M. Y., Mo, S. -K., Fedorov, A. -V., and Chiang, T. -C. Unique Gap Structure and Symmetry of the Charge Density Wave in Single-Layer VSe2. United States: N. p., 2018. Web. doi:10.1103/PhysRevLett.121.196402.
Chen, P., Pai, Woei Wu, Chan, Y. -H., Madhavan, V., Chou, M. Y., Mo, S. -K., Fedorov, A. -V., & Chiang, T. -C. Unique Gap Structure and Symmetry of the Charge Density Wave in Single-Layer VSe2. United States. doi:10.1103/PhysRevLett.121.196402.
Chen, P., Pai, Woei Wu, Chan, Y. -H., Madhavan, V., Chou, M. Y., Mo, S. -K., Fedorov, A. -V., and Chiang, T. -C. Fri . "Unique Gap Structure and Symmetry of the Charge Density Wave in Single-Layer VSe2". United States. doi:10.1103/PhysRevLett.121.196402. https://www.osti.gov/servlets/purl/1571123.
@article{osti_1571123,
title = {Unique Gap Structure and Symmetry of the Charge Density Wave in Single-Layer VSe2},
author = {Chen, P. and Pai, Woei Wu and Chan, Y. -H. and Madhavan, V. and Chou, M. Y. and Mo, S. -K. and Fedorov, A. -V. and Chiang, T. -C.},
abstractNote = {Single layers of transition metal dichalcogenides (TMDCs) are great candidates for electronic applications beyond the graphene platform; many of them exhibit novel properties including charge density waves (CDWs) and magnetic ordering. CDWs in these single layers are typically a planar projection of the corresponding bulk CDWs because of the quasi-two-dimensional nature of TMDCs; a different CDW symmetry is unexpected. We report herein the successful creation of pristine single-layer VSe2, which shows a ($\sqrt{7}×\sqrt{3}$) CDW in contrast to the (4×4) CDW for the layers in bulk VSe2. Angle-resolved photoemission spectroscopy from the single layer shows a sizable ($\sqrt{7}×\sqrt{3}$) CDW gap of ~100 meV at the zone boundary, a 220 K CDW transition temperature twice the bulk value, and no ferromagnetic exchange splitting as predicted by theory. This robust CDW with an exotic broken symmetry as the ground state is explained via a first-principles analysis. The findings illustrate a unique CDW phenomenon in the two-dimensional limit.},
doi = {10.1103/PhysRevLett.121.196402},
journal = {Physical Review Letters},
number = 19,
volume = 121,
place = {United States},
year = {2018},
month = {11}
}

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