1.
Phys Rev Lett
; 128(24): 247401, 2022 Jun 17.
Artículo
en Inglés
| MEDLINE
| ID: mdl-35776456
RESUMEN
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 â¼25 THz and at a finite in-plane momentum k_{â} leads to the emergence of a narrowband maximum in the probe reflectivity at k_{â}=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.