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arXiv:hep-th/9907073 · Physics Letters A

Bose–Einstein condensation and superfluidity of a weakly-interacting photon gas in a nonlinear Fabry–Perot cavity

Alessandro Tanzini Σ, Silvio Paolo sorella

Published Nov 1, 1999• 8 citations
arXivHTMLPDF
DOI
10.1016/s0375-9601(99)00716-1

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We discuss the possibility that photons, which are bosons, can form a 2D superfluid due to Bose-Einstein condensation inside a nonlinear Fabry-Perot cavity filled with atoms in their ground states. A "photon fluid" forms inside the cavity as a result of multiple photon-photon collisions mediated by the atoms during a cavity ring-down time. The effective mass and chemical potential for a photon inside this fluid are nonvanishing. This implies the existence of a Bogoliubov dispersion relation for the low-lying elementary excitations of the photon fluid, and in particular, that sound waves exist for long-wavelength, low-frequency disturbances of this fluid. Possible experiments to test for the superfluidity of the photon fluid based on the Landau critical-velocity criterion will be discussed.