Nonlinear optical response of the Si(111)-(2×1) surface exciton: Influence of biexciton many-body correlations

R. Oszwałdowski, M. Reichelt, T. Meier, Stephan W Koch, Michael Rohlfing

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A microscopic theory is presented which is capable of describing the influence of biexciton many-body correlations on the nonlinear optical response of the Si(111)-(2×1) surface exciton. The band structure and the quasiparticle wave functions of this surface are obtained by ab initio many-body perturbation theory within the GW method. These results are used as a basis for setting up semiconductor Bloch equations. Analyzing the optical response including many-body correlations in the coherent χ(3) limit, it is shown that for resonant and near-resonant excitation of the surface exciton, the correlations contribute significantly to the optical response. The binding energy of the surface biexciton is predicted to be about 18meV.

Original languageEnglish (US)
Article number235324
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number23
Publication statusPublished - Jun 15 2005
Externally publishedYes


ASJC Scopus subject areas

  • Condensed Matter Physics

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