Experimental studies of the excitonic nonlinear response of GaAs-based type-I and type-II quantum well structures interacting with optical and terahertz fields

Markus Stein; Felix Schäfer; Daniel Anders; Jan H. Littmann; Melanie Fey; Alexander Trautmann; Cong Ngo; Johannes T. Steiner; Matthias Reichelt; Christian Fuchs; Kerstin Volz; Torsten Meier; Sangam Chatterjee

doi:10.1117/12.2650291

15 March 2023 Experimental studies of the excitonic nonlinear response of GaAs-based type-I and type-II quantum well structures interacting with optical and terahertz fields

Markus Stein, Felix Schäfer, Daniel Anders, Jan H. Littmann, Melanie Fey, Alexander Trautmann, Cong Ngo, Johannes T. Steiner, Matthias Reichelt, Christian Fuchs, Kerstin Volz, Torsten Meier, Sangam Chatterjee

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Proceedings Volume 12419, Ultrafast Phenomena and Nanophotonics XXVII; 1241909 (2023) https://doi.org/10.1117/12.2650291
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

The nonlinear optical response of quantum well excitons is investigated experimentally using polarization resolved four wave mixing, optical-pump optical-probe, and optical-pump Terahertz-probe spectroscopy. The four-wave mixing data reveal clear signatures of coherent biexcitons which concur with straight-forward polarization selection rules at the Γ point. The type-I samples show the well-established time-domain beating signatures in the transients as well as the corresponding spectral signatures clearly. The latter are also present in type-II samples; however, the smaller exciton and biexciton binding energies in these structures infer longer beating times which, in turn, are accompanied by faster dephasing of the type-II exciton coherences. Furthermore, the THz absorption following spectrally narrow, picosecond excitation at energies in the vicinity of the 1s exciton resonance are discussed. Here, the optical signatures yield the well-established redshifts and blueshifts for the appropriate polarization geometries in type-I quantum well samples also termed “AC Stark Effect”. The THz probe reveals intriguing spectral features which can be ascribed to coherent negative absorption following an excitation into a virtual state for an excitation below the 1s exciton resonance. Furthermore, the scattering and ionization of excitons is discussed for several excitation geometries yielding control rules for elastic and inelastic quasiparticle collisions.

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Markus Stein, Felix Schäfer, Daniel Anders, Jan H. Littmann, Melanie Fey, Alexander Trautmann, Cong Ngo, Johannes T. Steiner, Matthias Reichelt, Christian Fuchs, Kerstin Volz, Torsten Meier, and Sangam Chatterjee "Experimental studies of the excitonic nonlinear response of GaAs-based type-I and type-II quantum well structures interacting with optical and terahertz fields", Proc. SPIE 12419, Ultrafast Phenomena and Nanophotonics XXVII, 1241909 (15 March 2023); https://doi.org/10.1117/12.2650291

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