We present ab initio calculations for both the wave functions and the energies of single quasiparticles. The conventional quasiparticle approach evaluates energy-level corrections to first order in the difference between the self-energy and the Kohn-Sham exchange-correlation potential. Here, we also recalculate the quasiparticle states. At the example of the GaAs(110) surface we show that this nonperturbative treatment is important for surfaces with electronic states close in energy but different with respect to their localization. As a sensitive observable the reflectance anisotropy is studied.

• Received 21 July 1999

DOI:https://doi.org/10.1103/PhysRevB.60.16758