Electronic structure and charge-density wave transition in monolayer VS2

Hyuk Jin Kim, Byoung Ki Choi, In Hak Lee, Min Jay Kim, Seung Hyun Chun, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Young Jun Chang

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Vanadium disulfide (VS2) attracts elevated interests for its charge-density wave (CDW) phase transition, ferromagnetism, and catalytic reactivity, but the electronic structure of monolayer has not been well understood yet. Here we report synthesis of epitaxial 1T VS2 monolayer on bilayer graphene grown by molecular-beam epitaxy (MBE). Angle-resolved photoemission spectroscopy (ARPES) measurements reveal that Fermi surface with six elliptical pockets centered at the M points shows gap opening at low temperature. Temperature-dependence of the gap size suggests existence of CDW phase transition above room temperature. Our observations provide important evidence to understand the strongly correlated electron physics and the related surface catalytic properties in two-dimensional transition-metal dichalcogenides (TMDCs).

Original languageEnglish
Pages (from-to)8-13
Number of pages6
JournalCurrent Applied Physics
Volume30
DOIs
StatePublished - Oct 2021

Keywords

  • Angle-resolved photoemission spectroscopy
  • Charge-density wave
  • Molecular-beam epitaxy
  • Transition-metal dichalcogenide
  • Vanadium disulfide

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