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

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 1 T 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 1 T -VTe₂ . We have revealed that monolayer 1 T -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.