Cluster model calculations with nonlocal screening channels of metallic and insulating VO2

We studied the changes in the electronic structure of VO2 across the metal-insulator transition. The main technique was cluster model calculations with nonlocal 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 nonlocal screening channels.