Multiband Fermi surface in $1T–$$\mathrm{VSe_2}$ and its implication for the charge density wave phase

Yilmaz, Turgut; Vescovo, Elio; Sinkovic, Boris

doi:10.1103/physrevb.107.165109

Multiband Fermi surface in $1T–$$$$\mathrm{VSe_2}$$ and its implication for the charge density wave phase

Journal Article · Thu Apr 06 04:00:00 EDT 2023 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.107.165109· OSTI ID:2352192

^[1]; Vescovo, Elio ^[1]; Sinkovic, Boris ^[2]

Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Univ. of Connecticut, Storrs, CT (United States)

Angle-resolved photoemission spectroscopy experiments reveal a surprisingly richer surface electronic structure in $1T–$$$$\mathrm{VSe_2}$$ than previously predicted or probed. Earlier claims supporting a charge density wave phase in this material are reexamined in terms of these findings and are found to be untenable. Here, the Fermi surface is found to be gapless, while band warping effects, currently attributed to three-dimensional lattice distortion, result from the simultaneous dispersion of the closely lying multiple bands. Based on these findings, a charge density wave scenario in $1T–$$$$\mathrm{VSe_2}$$ is unlikely. On the other side, the presence of multiple states crossing the Fermi level should constitute relevant constraints for any viable microscopic model of the structural phase transition of $$\mathrm{VSe_2}$$.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: SC0012704

OSTI ID:: 2352192

Report Number(s):: BNL--225621-2024-JAAM

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 16 Vol. 107; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
angle-resolved photoemission spectroscopy
charge density waves
density functional calculations
electronic structure
transition metal dichalcogenides

Multiband Fermi surface in $1T–$$$$\mathrm{VSe_2}$$ and its implication for the charge density wave phase

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