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Dynamical phase diagram of ultracold Josephson junctions

Lookup NU author(s): Klejdja Xhani, Dr Luca Galantucci, Professor Carlo Barenghi, Professor Nikolaos ProukakisORCiD

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).

Abstract

© 2020 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft.We provide a complete study of the phase diagram characterising the distinct dynamical regimes emerging in a three-dimensional Josephson junction in an ultracold quantum gas. Considering trapped ultracold superfluids separated into two reservoirs by a barrier of variable height and width, we analyse the population imbalance dynamics following a variable initial population mismatch. We demonstrate that as the chemical potential difference is increased, the system transitions from Josephson plasma oscillations to either a dissipative (in the limit of low and narrow barriers) or a self-trapped regime (for large and wider barriers), with a crossover between the dissipative and the self-trapping regimes which we explore and characterize for the first time. This work, which extends beyond the validity of the standard two-mode model, connects the role of the barrier width, vortex rings and associated acoustic emission with different regimes of the superfluid dynamics across the junction, establishing a framework for its experimental observation, which is found to be within current experimental reach.

Publication metadata

Author(s): Xhani K, Galantucci L, Barenghi CF, Roati G, Trombettoni A, Proukakis NP

Publication type: Article

Publication status: Published

Journal: New Journal of Physics

Year: 2020

Volume: 22

Issue: 12

Online publication date: 07/12/2020

Acceptance date: 09/11/2020

Date deposited: 29/01/2021

ISSN (electronic): 1367-2630

Publisher: IOP Publishing Ltd

URL: https://doi.org/10.1088/1367-2630/abc8e4

DOI: 10.1088/1367-2630/abc8e4

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