Relaxation in an Extended Bosonic Josephson Junction

• URL: http://arxiv.org/abs/2012.05885v2
• Date: Mon, 10 May 2021 15:38:05 GMT
• Title: Relaxation in an Extended Bosonic Josephson Junction
• Authors: Jan-Frederik Mennemann, Igor E. Mazets, Marine Pigneur, Hans Peter Stimming, Norbert J. Mauser, J\"org Schmiedmayer, Sebastian Erne
• Abstract summary: We show that persisting classical field simulations using Gross-Pitaevskii equations reproduce the main experimental findings. For longer times, the observed relaxation to a phase locked state is caused by nonlinear dynamics beyond the sine-Gordon model. We analyze different experimentally relevant trapping geometries to mitigate these effects.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We present a detailed analysis of the relaxation dynamics in an extended bosonic Josephson junction. We show that stochastic classical field simulations using Gross-Pitaevskii equations in three spatial dimensions reproduce the main experimental findings of M. Pigneur et al., Phys. Rev. Lett. 120, 173601 (2018). We give an analytic solution describing the short time evolution through multimode dephasing. For longer times, the observed relaxation to a phase locked state is caused by nonlinear dynamics beyond the sine-Gordon model, induced by the longitudinal confinement potential and persisting even at zero temperature. Finally, we analyze different experimentally relevant trapping geometries to mitigate these effects. Our results provide the basis for future experimental implementations aiming to study nonlinear and quantum effects of the relaxation in extended bosonic Josephson junctions.

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