Quasiparticle intepretation of photoemission spectra and optical properties of GaAs(110)

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Abstract
We investigate the quasiparticle band structure and optical properties of a relaxed GaAs(110) surface using a first-principles Green’s-function approach. The local fields and the dynamical correlation are fully incorporated in the evaluation of the electron self-energy operator. The results provide a quantitative interpretation of the photoemission, inverse photoemission, and reflectivity spectra observed for this surface. Implications of our theoretical surface band structure for the current controversy between various experimental results for the position of the empty surface band are discussed.