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Josephson junctions are essential ingredients in the superconducting circuitsused in many existing quantum technologies. Additionally, ultracold atomicquantum gases have also become essential platforms to study superfluidity.Here, we explore the analogy between superconductivity and superfluidity topresent an intriguing effect caused by a thin finite barrier in aquasi-one-dimensional toroidal spinor Bose--Einstein condensate (BEC). In thissystem, the atomic current density flowing through the edges of the barrieroscillates, such as the electrical current through a Josephson junction in asuperconductor, but in our case, there is no current circulation through thebarrier. We also show how the nontrivial broken-symmetry states of spinor BECschange the structure of this Josephson-like current, creating the possibilityto probe the spinor symmetry, solely using measurements of this superfluidcurrent.

Josephson-like oscillations in toroidal spinor Bose-Einstein condensates: a prospective symmetry probe