Intersubband Polariton-Polariton Scattering in a Dispersive Microcavity
Authors: 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.
Autors Affiliation: Department of Physics, University of Regensburg, 93040 Regensburg, Germany; Centre de Nanosciences et de Nanotechnologies (C2N), CNRS UMR 9001, University Paris Saclay, 91120 Palaiseau, France; INO-CNR BEC Center and Dipartimento di Fisica, Universita di Trento, I-38123 Povo, Italy; Laboratorio TASC, CNR-IOM, Area Science Park, 34149 Basovizza, Trieste, Italy; Department of Physics, TU Dortmund University, 44227 Dortmund, Germany
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.
Journal/Review: PHYSICAL REVIEW LETTERS
Volume: 128 (24) Pages from: 247401-1 to: 247401-7
More Information: We thank Martin Furthmeier, Ignaz Laepple, and Imke Gronwald for technical assistance, and Simone De Liberato for discussions. This work was supported by the European Union Future and Emerging Technologies (FET) Grant No. 737017 (MIR-BOSE) . This work was partially supported by the French RENATECH network. The experiments in Regensburg were partially supported by the Deutsche Forschungsgemeinschaft through research Grant No. HU1598/8.KeyWords: BOSE-EINSTEIN CONDENSATION; MATTER; LIGHTDOI: 10.1103/PhysRevLett.128.247401