  We studied the changes in the electronic structure of VO2 across the
metal-insulator transition. The main technique was cluster model calculations
with non-local screening channels. The calculation included a screening from a
coherent state at the Fermi level in the metallic phase, and a screening from a
Hubbard charge fluctuation within the V-V dimmer in the insulating phase. The
calculation results are compared to previous photoemission and X-ray absorption
spectra. The coherent feature at the Fermi level in the metallic phase is due
to the coherent screening. But the Hubbard screened state in the insulating
phase appears at higher energies opening the band gap. The changes in the
electronic structure of VO2 are thus related to the non-local screening
channels.
