Finite-temperature hydrodynamics for one-dimensional Bose gases: Breathing-mode oscillations as a case study

Abstract : We develop a finite-temperature hydrodynamic approach for a harmonically trapped one-dimensional quasi-condensate and apply it to describe the phenomenon of frequency doubling in the breathing-mode oscillations of the quasicondensate momentum distribution. The doubling here refers to the oscillation frequency relative to the oscillations of the real-space density distribution, invoked by a sudden confinement quench. By constructing a nonequilibrium phase diagram that characterises the regime of frequency doubling and its gradual disappearance , we find that this crossover is governed by the quench strength and the initial temperature, rather than by the equilibrium-state crossover from the quasicondensate to the ideal Bose gas regime. The hydrodynamic predictions are supported by the results of numerical simulations based on a finite-temperature c-field approach, and extend the utility of the hydrodynamic theory for low-dimensional quantum gases to the description of finite-temperature systems and their dynamics in momentum space.
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Physical Review A, American Physical Society, 2016, 94, pp.051602(R). 〈10.1103/PhysRevA.94.051602〉
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Isabelle Bouchoule, S Szigeti, M Davis, K Kheruntsyan. Finite-temperature hydrodynamics for one-dimensional Bose gases: Breathing-mode oscillations as a case study. Physical Review A, American Physical Society, 2016, 94, pp.051602(R). 〈10.1103/PhysRevA.94.051602〉. 〈hal-01422001〉

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