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Josephson vortices and persistent current in a double-ring supersolid system

M. Schubert1,*, K. Mukherjee1,†, T. Pfau2, and S. M. Reimann1

  • *Contact author: malte.schubert@fysik.lu.se
  • †Contact author: koushik.mukherjee@fysik.lu.se
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Phys. Rev. Research 7, 033110 – Published 1 August, 2025

DOI: https://doi.org/10.1103/tl7c-v5bs

Abstract

We theoretically investigate the properties of ultracold dipolar atoms in radially coupled, concentric annular traps created by a potential barrier. The nonrotating ground-state phases are investigated across the superfluid-supersolid phase transition, revealing a particle imbalance between the two rings and a preferential density modulation in the outer ring in the absence of rotation. Near the phase transition on the superfluid side, applying rotation can induce density modulations in either ring, depending on the angular momentum and barrier strength. For low angular momentum, such rotation-induced density modulation forms in the outer ring, while for high angular momentum and weak barriers, it emerges in the inner ring. Rotation can lead to persistent currents and the nucleation of a vortex residing either at the center (central vortex) or at the ring junction (Josephson vortex). Josephson vortices can also form at the junctions of the localized density sites induced by rotation in the inner ring, a behavior that is unique to our system. By switching off the trap and allowing the system to expand, distinct interference patterns emerge, which can be analyzed to identify and distinguish between various vortex configurations, and thus can be observed in current state-of-the-art experiments.

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Phys. Rev. Research 7, 033110– Published 1 August, 2025
  • Received 14 March 2025
  • Accepted 23 June 2025
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