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arXiv · 2201.05056

Intersubband polariton-polariton scattering in a dispersive microcavity

M. Knorr·J. M. Manceau·J. Mornhinweg·J. Nespolo·G. Biasiol·N. L. Tran·M. Malerba·P. Goulain·X. Lafosse·M. Jeannin·M. Stefinger·I. Carusotto·C. Lange·R. Colombelli·R. Huber
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Abstract

The ultrafast scattering dynamics of intersubband polaritons in dispersive cavities embedding GaAs/AlGaAs quantum wells are studied directly within their band structure using a non-collinear pump-probe geometry with phase-stable mid-infrared pulses. Selective excitation of the lower polariton at a frequency of ~25 THz and at a finite in-plane momentum, $k_{||}$, leads to the emergence of a narrowband maximum in the probe reflectivity at $k_{||}=0$. A quantum mechanical model identifies the underlying microscopic process as stimulated coherent polariton-polariton scattering. These results mark an important milestone towards quantum control and bosonic lasing in custom-tailored polaritonic systems in the mid and far-infrared.

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M. Knorr, J. M. Manceau, J. Mornhinweg, J. Nespolo, G. Biasiol, N. L. Tran, M. Malerba, P. Goulain, X. Lafosse, M. Jeannin, M. Stefinger, I. Carusotto, C. Lange, R. Colombelli, R. Huber. 2022-01-13. Intersubband polariton-polariton scattering in a dispersive microcavity. https://doi.org/10.1103/physrevlett.128.247401

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