We discuss the electronic properties of VO2 in its monoclinic, insulating p
hase, by comparing the results of quasiparticle band structure calculations
obtained within a model GW scheme with those of both LDA calculations and
available experiments. Our calculations are based on the full-potential-lin
earized-augmented-plane-wave method. We obtain the correct energy gap for t
his compound and a density of states consistent with photoemission results.
Moreover, we show that model GW calculations reproduce satisfactorily the
imaginary part of the dielectric constant as obtained by optical and EELS m
easurements. [S0163-1829(99)11147-0].