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Title: Dimensional crossover and symmetry transformation of charge density waves in VSe 2

Journal Article · · Physical Review. B
ORCiD logo [1];  [2];  [3];  [1];  [1];  [4];  [5]; ORCiD logo [6]
  1. Shanghai Jiao Tong Univ. (China)
  2. Academia Sinica, Taipei (Taiwan); National Center for Theoretical Sciences, Taipei (Taiwan)
  3. Univ. of Illinois at Urbana-Champaign, IL (United States); National Synchrotron Radiation Research Center, Hsinchu (Taiwan)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  5. Academia Sinica, Taipei (Taiwan); National Taiwan Univ., Taipei (Taiwan); Georgia Institute of Technology, Atlanta, GA (United States)
  6. Univ. of Illinois at Urbana-Champaign, IL (United States)
+ Show Author Affiliations

Collective phenomena in solids can be sensitive to the dimensionality of the system; a case of special interest is VSe2, which shows a (√7×√3) charge density wave (CDW) in the single layer with threefold symmetry in the normal phase spontaneously broken, in contrast to the (4×4) in-plane CDW in the bulk. Angle-resolved photoemission spectroscopy (ARPES) from VSe2 ranging from a single layer to the bulk reveals the evolution of the electronic structure including the Fermi surface contours and the CDW gap. At a thickness of two layers, the ARPES maps are already nearly bulklike, but the transition temperature TC for the (4×4) CDW is much higher than the bulk value of 110 K. These results can be understood as due to dimensional crossover of phonon instability driven by a competition of nesting vectors. Here, in this letter, we provide key insights into the CDW mechanisms and offer a perspective in the search and control of emergent phases in quantum materials.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; Ministry of Science and Technology of China; Science and Technology Commission of Shanghai Municipality; National Center for Theoretical Sciences (NCTS)
Grant/Contract Number:
AC02-05CH11231; FG02-07ER46383; 2021YFE0194100; 21JC1403000; 110-2124-M-002-012
OSTI ID:
1959977
Journal Information:
Physical Review. B, Vol. 105, Issue 16; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (4)

FIG 1(p. 15)figure FIG 1
FIG 2(p. 16)figure FIG 2
FIG 3(p. 18)figure FIG 3
FIG 4(p. 19)figure FIG 4

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
charge density waves
multilayer thin films
transition metal dichalcogenides
angle-resolved photoemission spectroscopy
molecular beam epitaxy