Experimental characterisation of nonlocal photon superfluids
Abstract
Quantum gases of atoms and exciton-polaritons are nowadays a well established theoretical and experimental tool for fundamental studies of quantum many-body physics and suggest promising applications to quantum computing. Given their technological complexity, it is of paramount interest to devise other systems where such quantum many-body physics can be investigated at a lesser technological expense. Here we examine a relatively well-known system of laser light propagating through thermo-optical defocusing media: based on a hydrodynamical description of light as a quantum fluid of interacting photons, we investigate such systems as a valid, room temperature alternative to atomic or exciton-polariton condensates for studies of many-body physics. First, we show that by using a technique traditionally used in oceanography, it is possible to perform a direct measurement of the single-particle part of the dispersion relation of the elementary excitations on top of the photon fluid and to detect its global flow. Then, using a pump-and-probe set-up, we investigate the collective nature of low-wavevector sound modes of the fluid and observe signatures of superfluid behaviour.
Cite
@article{arxiv.1501.06728,
title = {Experimental characterisation of nonlocal photon superfluids},
author = {David Vocke and Thomas Roger and Francesco Marino and Ewan M. Wright and Iacopo Carusotto and Matteo Clerici and Daniele Faccio},
journal= {arXiv preprint arXiv:1501.06728},
year = {2015}
}