Self-energy corrections inVO2within a modelGWscheme

Abstract

We discuss the electronic properties of ${\mathrm{VO}}_2$ in its monoclinic, insulating phase, by comparing the results of quasiparticle band structure calculations obtained within a model $\mathrm{GW}$ scheme with those of both LDA calculations and available experiments. Our calculations are based on the full-potential-linearized-augmented-plane-wave method. We obtain the correct energy gap for this compound and a density of states consistent with photoemission results. Moreover, we show that model $\mathrm{GW}$ calculations reproduce satisfactorily the imaginary part of the dielectric constant as obtained by optical and EELS measurements.