Long-lived non-thermal states realized by atom losses in one-dimensional quasi-condensates

Abstract : We investigate the cooling produced by a loss process non selective in energy on a one-dimensional (1D) Bose gas with repulsive contact interactions in the quasi-condensate regime. By performing nonlinear classical field calculations for a homogeneous system, we show that the gas reaches a non-thermal state where different modes have acquired different temperatures. After losses have been turned off, this state is robust with respect to the nonlinear dynamics, described by the Gross-Pitaevskii equation. We argue that the integrability of the Gross-Pitaevskii equation is linked to the existence of such long-lived non-thermal states, and illustrate this by showing that such states are not supported within a non-integrable model of two coupled 1D gases of different masses. We go beyond a classical field analysis, taking into account the quantum noise introduced by the discreteness of losses, and show that the non-thermal state is still produced and its non-thermal character is even enhanced. Finally, we extend the discussion to gases trapped in a harmonic potential and present experimental observations of a long-lived non-thermal state within a trapped 1D quasi-condensate following an atom loss process.
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Article dans une revue
Physical Review A, American Physical Society, 2017, 96, pp.013623
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Dernière modification le : mardi 16 janvier 2018 - 17:56:01
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  • HAL Id : hal-01479415, version 3
  • ARXIV : 1703.00322

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A. Johnson, S. Szigeti, M. Schemmer, Isabelle Bouchoule. Long-lived non-thermal states realized by atom losses in one-dimensional quasi-condensates. Physical Review A, American Physical Society, 2017, 96, pp.013623. 〈hal-01479415v3〉

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