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

R. Oszwałdowski; M. Reichelt; T. Meier; S. W. Koch; Michael Rohlfing

doi:10.1103/PhysRevB.71.235324

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

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

Optical Sciences, College of

Research output: Contribution to journal › Article › peer-review

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Abstract

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 language	English (US)
Article number	235324
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	71
Issue number	23
DOIs	https://doi.org/10.1103/PhysRevB.71.235324
State	Published - Jun 15 2005

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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AU - Meier, T.

AU - Koch, S. W.

AU - Rohlfing, Michael

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AB - 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.

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

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