The ultrafast scattering dynamics of intersubband polaritons in dispersive cavities embedding GaAs/AlGaAs quantum wells are studied directly within their band structure using a noncollinear pump-probe geometry with phase-stable midinfrared 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 toward quantum control and bosonic lasing in custom-tailored polaritonic systems in the mid and far infrared.
Intersubband Polariton-Polariton Scattering in a Dispersive Microcavity / Knorr, M.; Manceau, J. M.; Mornhinweg, J.; Nespolo, J.; Biasiol, G.; Tran, N. L.; Malerba, M.; Goulain, P.; Lafosse, X.; Jeannin, M.; Stefinger, M.; Carusotto, I.; Lange, C.; Colombelli, R.; Huber, R.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 128:24(2022). [10.1103/physrevlett.128.247401]
Intersubband Polariton-Polariton Scattering in a Dispersive Microcavity
Malerba, M.;
2022
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 noncollinear pump-probe geometry with phase-stable midinfrared 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 toward quantum control and bosonic lasing in custom-tailored polaritonic systems in the mid and far infrared.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
