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Experimental characterization of nonlocal photon fluids

  Articoli su Riviste JCR/ISI  (anno 2015)

Autori:  Vocke D., Roger T., Marino F., Wright E.M., Carusotto I., Clerici M., Faccio D

Affiliazione Autori:  Institute of Photonics and Quantum Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK; CNR-INO, Largo Enrico Fermi 6, I-50025 Firenze, Italy; College of Optical Sciences, University of Arizona, Tucson, Arizona 85721, USA: INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento, I-38123 Povo, Italy

Riassunto:  Quantum gases of atoms and exciton-polaritons are now well-established theoretical and experimental tools 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 lesser technological expense. Here we examine a relatively well-known system of laser light propagating through thermo-optical defocusing media: based on a hydrodynamic 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 setup, we investigate the dispersion of excitation modes of the fluid: for very long wavelengths, a sonic, dispersionless propagation is observed that we interpret as a signature of superfluid behavior. (C) 2015 Optical Society of America.

Rivista/Giornale:  OPTICA
Volume n.:  2 (5)      Pagine da: 484  a: 490
Ulteriori informazioni:  Autonomous Province of Trento; Engineering and Physical Sciences Research Council (EPSRC) (EP/J00443X/1); European Research Council (ERC) (306559).
DOI: 10.1364/OPTICA.2.000484

*Impact Factor della Rivista: (2015) 5.205   *Citazioni: 30
data tratti da "WEB OF SCIENCE" (marchio registrato di Thomson Reuters) ed aggiornati a:  19/05/2019

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