  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
temperature is characterized by a metallic state whereas the nesting condition
is better than that of isostructural monolayer VSe2 which undergoes a CDW
transition to insulator at low temperature. The present result suggests an
importance of Fermi-surface topology for characterizing the CDW properties of
monolayer TMDs.
