Unique Gap Structure and Symmetry of the Charge Density Wave in Single-Layer VSe2

Chen, P.; Pai, Woei Wu; Chan, Y. -H.; Madhavan, V.; Chou, M. Y.; Mo, S. -K.; Fedorov, A. -V.; Chiang, T. -C.

doi:10.1103/PhysRevLett.121.196402

Unique Gap Structure and Symmetry of the Charge Density Wave in Single-Layer ${VSe}_{2}$

Journal Article · Thu Nov 08 23:00:00 EST 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.121.196402· OSTI ID:1571123

Chen, P. ^[1]; Pai, Woei Wu ^[2]; Chan, Y. -H. ^[3]; Madhavan, V. ^[4]; Chou, M. Y. ^[5]; Mo, S. -K. ^[6]; Fedorov, A. -V. ^[6]; Chiang, T. -C. ^[7]

Univ. of Illinois at Urbana-Champaign, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
National Taiwan Univ., Taipei (Taiwan)
Academia Sinica, Taipei (Taiwan)
Univ. of Illinois at Urbana-Champaign, IL (United States)
National Taiwan Univ., Taipei (Taiwan); Academia Sinica, Taipei (Taiwan); Georgia Inst. of Technology, Atlanta, GA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
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.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (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)

Grant/Contract Number:: AC02-05CH11231; FG02-07ER46383

OSTI ID:: 1571123

Alternate ID(s):: OSTI ID: 1481451

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 19 Vol. 121; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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