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arXiv · 2311.07228

Bound Bogoliubov quasiparticles in photon superfluids

Marzena Ciszak·Francesco Marino
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Abstract

Bogoliubov's description of Bose gases relies on the linear dynamics of noninteracting quasiparticles on top of a homogeneous condensate. Here, we theoretically explore the weakly-nonlinear regime of a one-dimensional photon superfluid in which phonon-like elementary excitations interact via their backreaction on the background flow. The generalized dispersion relation extracted from spatiotemporal intensity spectra reveals additional branches that correspond to bound Bogoliubov quasiparticles -- phase-locked collective excitations originating from nonresonant harmonic-generation and wave-mixing processes. These mechanisms are inherent to fluctuation dynamics and highlight non-trivial scattering channels other than resonant interactions that could be relevant in the emergence of dissipative and turbulent phenomena in superfluids.

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Marzena Ciszak, Francesco Marino. 2023-11-13. Bound Bogoliubov quasiparticles in photon superfluids. https://doi.org/10.1103/physrevresearch.6.l032006

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