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

Journal Article · · Physical Review Letters
 [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)

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.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
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)
Grant/Contract Number:
AC02-05CH11231; FG02-07ER46383
OSTI ID:
1571123
Alternate ID(s):
OSTI ID: 1481451
Journal Information:
Physical Review Letters, Vol. 121, Issue 19; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 113 works
Citation information provided by
Web of Science

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Cited By (12)

Van der Waals magnets: Wonder building blocks for two‐dimensional spintronics? journal October 2019
Interaction of VSe 2 with Ambient Gases: Stability and Chemical Reactivity journal July 2019
Structural phase transitions in VSe 2 : energetics, electronic structure and magnetism journal January 2019
VSe 2 nanosheets for ultrafast fiber lasers journal January 2020
Doping induced charge density wave in monolayer TiS 2 and phonon-mediated superconductivity journal January 2020
Memristive phase switching in two-dimensional 1T′-VSe 2 crystals journal January 2020
Thickness-dependent magnetotransport properties in 1T VSe 2 single crystals prepared by chemical vapor deposition journal January 2020
Proximity-induced ferromagnetism and chemical reactivity in few-layer VSe 2 heterostructures journal January 2020
Dimensionality-Mediated Semimetal-Semiconductor Transition in Ultrathin PtTe 2 Films journal January 2020
Theory and simulations of critical temperatures in CrI 3 and other 2D materials: easy-axis magnetic order and easy-plane Kosterlitz–Thouless transitions journal September 2019
Theory and simulations of critical temperatures in CrI3 and other 2D materials: Easy-axis magnetic order and easy-plane Kosterlitz-Thouless transitions text January 2019
Morphology Control of Epitaxial Monolayer Transition Metal Dichalcogenides text January 2019

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