Symmetry Breaking in Interacting Ring-Shaped Superflows of Bose–Einstein Condensates

Autor: Boris A. Malomed, Artem Oliinyk, Igor Yatsuta, Alexander Yakimenko
Rok vydání: 2019
Předmět:
Zdroj: Symmetry
Volume 11
Issue 10
Symmetry, Vol 11, Iss 10, p 1312 (2019)
ISSN: 2073-8994
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: OpenAIRE
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