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 characteristics of the quantum fluid, and explains our measurement quantitatively. This work clarifies the role of such a reservoir in polariton quantum hydrodynamics. It also provides an unambiguous tool to determine the condensate-to-reservoir fraction in the quantum fluid, and sets an accurate framework to approach ideas for polariton-based quantum-optical applications.

journal_name

Nat Commun

journal_title

Nature communications

authors

Stepanov P,Amelio I,Rousset JG,Bloch J,Lemaître A,Amo A,Minguzzi A,Carusotto I,Richard M

doi

10.1038/s41467-019-11886-3

subject

Has Abstract

pub_date

2019-08-27 00:00:00

pages

3869

issue

1

issn

2041-1723

pii

10.1038/s41467-019-11886-3

journal_volume

10

pub_type

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