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HL: Fachverband Halbleiterphysik

HL 61: Focus Session: Tailored Nonlinear Photonics I

HL 61.9: Vortrag

Donnerstag, 19. März 2020, 12:45–13:00, POT 51

Semiclassical theory of multi-photon absorption in bulk zinc-blende type semiconductors — •Wolf-Rüdiger Hannes and Torsten Meier — Department of Physics and CeOPP, University of Paderborn, Warburger Str. 100, D-33098 Paderborn, Germany

Multi-photon absorption coefficients of zinc-blende type semiconductors are studied in the independent-electron approximation. Our theory is based on a gauge-invariant form of the semiconductor Bloch equations including inter- and intraband excitations. Extending our initial analysis [1,2] we use a GaAs bandstructure and complex dipole moments obtained from k·p theory. Considering a pump-probe scheme, the nonlinear-optical response is analyzed for varying excitation parameters, such as pulse frequencies, propagation directions, and polarization angles. Analytical solutions are obtained for near half-gap excitation in the cw-limit using a simplified multiband model valid in the vicinity of the Γ-point. We also investigate multi-photon absorption in a non-perturbative regime, where it shows Rabi-like oscillations as a function of the light intensity.
[1] W.-R. Hannes and T. Meier, Phys. Rev. B 99, 125301 (2019).
[2] W.-R. Hannes, L. Krauß-Kodytek, C. Ruppert, M. Betz, and T. Meier, Proceedings of the SPIE 10916, 109160O (2019).