Symmetry breaking in interacting ring-shaped superflows of Bose-Einstein condensates
| Autor: | Oliinyk, Artem, Yatsuta, Igor, Malomed, Boris, Yakimenko, Alexander |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Symmetry 2019, 11, 1312; "Symmetry Breaking Bose-Einstein Condensates" (special issue of the MDPI journal) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.3390/sym11101312 |
| Popis: | We demonstrate that the evolution of superflows in interacting persistent currents of ultracold gases is strongly affected by symmetry breaking of the quantum vortex dynamics. We study counter-propagating superflows in a system of two parallel rings in regimes of weak (a Josephson junction with tunneling through the barrier) and strong (rings merging across a reduced barrier) interactions. For the weakly interacting toroidal Bose-Einstein condensates, formation of rotational fluxons (Josephson vortices) is associated with spontaneous breaking of the rotational symmetry of the tunneling superflows. The influence of a controllable symmetry breaking on the final state of the merging counter-propagating superflows is investigated in the framework of a weakly dissipative mean-field model. It is demonstrated that the population imbalance between the merging flows and the breaking of the underlying rotational symmetry can drive the double-ring system to final states with different angular momenta. Comment: 11 pages, 5 figures |
| Databáze: | arXiv |
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