Optical second harmonic generation from Wannier excitons

Details Optical second harmonic generation from Wannier excitons Optical second harmonic generation from Wannier excitons

2007-03-08

arxiv.org/abs/cond-mat/0703203v1

Europhysics Letters vol 78, No 2 (April 2007) 27005 (5pp)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1209/0295-5075/78/27005

Excitonic effects in the linear optical response of semiconductors are well-known and the subject of countless experimental and theoretical studies. For the technologically important second order nonlinear response, however, description of excitonic effects has proved to be difficult. In this work, a simplified three-band Wannier exciton model of cubic semiconductors is applied and a closed form expression for the complex second harmonic response function including broadening is derived. Our calculated spectra are found to be in excellent agreement with the measured response near the band edge. In addition, a very substantial enhancement of the nonlinear response is predicted for the transparency region.

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