Superradiant scattering in fluids of light

Year: 2019

Authors: Prain A., Maitland C., Faccio D., Marino F.

Autors Affiliation: Institute of Photonics and Quantum Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom; School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom; CNR-Istituto Nazionale di Ottica I-50019 Sesto Fiorentino (FI), Italy; INFN, Sez. di Firenze, I-50019 Sesto Fiorentino (FI), Italy.

Abstract: We investigate the scattering process of Bogoliubov excitations on a rotating photon fluid. Using the language of Noether currents we demonstrate the occurrence of a resonant amplification phenomenon, which reduces to the standard superradiance in the hydrodynamic limit. We make use of a time-domain formulation where superradiance emerges as a transient effect encoded in the amplitudes and phases of propagating localized wave packets. Our findings generalize previous studies in quantum fluids to the case of a non-negligible quantum pressure and can be readily applied also to other physical systems, in particular atomic Bose-Einstein condensates. Finally we discuss ongoing experiments to observe superradiance in photon fluids and how our time domain analysis can be used to characterize superradiant scattering in nonideal experimental conditions.

Journal/Review: PHYSICAL REVIEW D

Volume: 100 (2)      Pages from: 24037-1  to: 24037-11

More Information: D. F. and A. P. acknowledge financial support from the EPSRC (UK, Grant No. EP/M009122/1) and EU Horizons 2020 (Marie-Sklodowska Curie Actions). This work has also received funding from the European Union’s Horizon 2020 research and innovation programme under Grant Agreement No. 820392. C. M. acknowledges studentship funding from EPSRC under CM-CDT Grant No. EP/L015110/1.
KeyWords: Over-reflection; Instability; Sound; Waves
DOI: 10.1103/PhysRevD.100.024037

Citations: 26
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