Monolayer VTe2: Incommensurate Fermi surface nesting and suppression of charge density waves

Katsuaki Sugawara, Yuki Nakata, Kazuki Fujii, Kosuke Nakayama, Seigo Souma, Takashi Takahashi, Takafumi Sato

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

We investigated the electronic structure of monolayer VTe2 grown on bilayer graphene by angle-resolved photoemission spectroscopy (ARPES). We found that monolayer VTe2 takes the octahedral 1T structure in contrast to the monoclinic one in the bulk, as evidenced by the good agreement in the Fermi surface topology between ARPES results and first-principles band calculations for octahedral monolayer 1T-VTe2. We have revealed that monolayer 1T-VTe2 at low temperatures is characterized by a metallic state whereas the nesting condition is better than that of isostructural monolayer VSe2 which undergoes a charge density wave (CDW) transition to an insulator at low temperatures. The present result suggests an importance of the Fermi surface topology for characterizing the CDW properties of monolayer transition-metal dichalcogenides.

Original languageEnglish
Article number241404
JournalPhysical Review B
Volume99
Issue number24
DOIs
Publication statusPublished - 2019 Jun 18

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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