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arXiv · 1501.06728

Experimental characterisation of nonlocal photon superfluids

David Vocke·Thomas Roger·Francesco Marino·Ewan M. Wright·Iacopo Carusotto·Matteo Clerici·Daniele Faccio
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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.

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David Vocke, Thomas Roger, Francesco Marino, Ewan M. Wright, Iacopo Carusotto, Matteo Clerici, Daniele Faccio. 2015-03-15. Experimental characterisation of nonlocal photon superfluids. https://arxiv.org/abs/1501.06728

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