Analysis of the nonlinear optical response of excitons in type-I and type-II quantum wells including many-body correlations

Alexander Trautmann; Markus Stein; Felix Schäfer; Daniel Anders; Cong Ngo; Johannes Tilman Steiner; Matthias Reichelt; Sangam Chatterjee; Torsten Meier

doi:10.1117/12.2650169

15 March 2023 Analysis of the nonlinear optical response of excitons in type-I and type-II quantum wells including many-body correlations

Alexander Trautmann, Markus Stein, Felix Schäfer, Daniel Anders, Cong Ngo, Johannes Tilman Steiner, Matthias Reichelt, Sangam Chatterjee, Torsten Meier

Author Affiliations +

Proceedings Volume 12419, Ultrafast Phenomena and Nanophotonics XXVII; 124190A (2023) https://doi.org/10.1117/12.2650169
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

The nonlinear optical response of quantum well excitons excited by optical fields is analyzed by numerical solutions of the semiconductor Bloch equations. Differential absorption spectra are computed for resonant pumping at the exciton resonance and the dependence of the absorption changes on the polarization directions of the pump and probe pulses is investigated. Coherent biexcitonic many-body correlations are included in our approach up to third-order in the optical fields. Results are presented for spatially-direct type-I and spatiallyindirect type-II quantum well systems. Due to the spatial inhomogeneity, in type-II structures a finite coupling between excitons of opposite spins exists already on the Hartree-Fock level and contributes to the absorption changes for the case of opposite circularly polarized pump and probe pulses.

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Alexander Trautmann, Markus Stein, Felix Schäfer, Daniel Anders, Cong Ngo, Johannes Tilman Steiner, Matthias Reichelt, Sangam Chatterjee, and Torsten Meier "Analysis of the nonlinear optical response of excitons in type-I and type-II quantum wells including many-body correlations", Proc. SPIE 12419, Ultrafast Phenomena and Nanophotonics XXVII, 124190A (15 March 2023); https://doi.org/10.1117/12.2650169

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