Dispersion relation of the collective excitations in a resonantly driven polariton fluid.

ABSTRACT: Exciton-polaritons in semiconductor microcavities constitute the archetypal realization of a quantum fluid of light. Under coherent optical drive, remarkable effects such as superfluidity, dark solitons or the nucleation of vortices have been observed, and can be all understood as specific manifestations of the condensate collective excitations. In this work, we perform a Brillouin scattering experiment to measure their dispersion relation [Formula: see text] directly. The results, such as a speed of sound which is apparently twice too low, cannot be explained upon considering the polariton condensate alone. In a combined theoretical and experimental analysis, we demonstrate that the presence of an excitonic reservoir alongside the polariton condensate has a dramatic influence on the chara

SUBMITTER: Stepanov P 

PROVIDER: S-EPMC6712214 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature