2020/07/26 by K. Xhani, Klejdja Xhani, Luca Galantucci +7
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Josephson effect #Josephson phase #Nonlinear Photonic Systems #Phase (matter) #Phase diagram #Physics #Physics of Superconductivity and Magnetism #Quantum #Quantum mechanics #Statistical physics #Superconductivity #Ultracold atom #cond-mat.quant-gas
paper · pdf · doi:10.1088/1367-2630/abc8e4
arxiv created 2020/07/26 · openalex publication_date 2020/11/10 · openalex created_date 2020/11/23 · arxiv updated 2020/12/30 · openalex updated_date 2026/08/05
Abstract 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.