  Charge density waves in transition metal dichalcogenides have been
intensively studied for their close correlation with Mott insulator,
charge-transfer insulator, and superconductor. VTe2 monolayer recently comes
into sight because of its prominent electron correlations and the mysterious
origin of CDW orders. As a metal of more than one type of charge density waves,
it involves complicated electron-electron and electron-phonon interactions.
Through a scanning tunneling microscopy study, we observed triple-Q 4-by-4 and
single-Q 4-by-1 modulations with significant charge and orbital separation. The
triple-Q 4-by-4 order arises strongly from the p-d hybridized states, resulting
in a charge distribution in agreement with the V-atom clustering model.
Associated with a lower Fermi level, the local single-Q 4-by-1 electronic
pattern is generated with the p-d hybridized states remaining 4-by-4 ordered.
In the spectroscopic study, orbital- and atomic- selective charge-density-wave
gaps with the size up to ~400 meV were resolved on the atomic scale.
