AB-INITIO CALCULATIONS OF THE QUASI-PARTICLE AND ABSORPTION-SPECTRA OF CLUSTERS - THE SODIUM TETRAMER

We report the first ab initio quasiparticle calculation in a real cluster Na-4 within Hedin's GW approximation for the valence electron self-energy. Our approach avoids the summations over empty states, and also eliminates the problem of residual interactions between the periodic images. Self-energy corrections open the local density approximation gap by more than 2 eV; finite-size effects on screening are shown to play an important role. The absorption spectrum calculated by including excitonic effects using our ab initio screened interaction gives a good account of the experimental photodepletion data.