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Persistent current oscillations in a double-ring quantum gas

Thomas Bland, I. V. Yatsuta, Mark Edwards +4 more

By introducing a repulsive barrier at the interface between two density-coupled rings of ultracold atoms, a persistent current can oscillate between the rings. The phenomenon persists indefinitely in the limit of zero temperature, but it decays at finite temperature and can even be suppressed completely in the limit of large damping.

arXiv:2204.14120Physical Review ResearchDec 8, 202220 citations

Manipulating the persistent current in quantum rings

Sigríður Sif Gylfadóttir

Jan 1, 20100 citations

Acceleration-induced transport of quantum vortices in joined atomtronic circuits

Andrii Chaika, Artem Oliinyk, I. V. Yatsuta +4 more

Persistent currents–inviscid quantized flow around an atomic circuit–are a crucial building block of atomtronic devices. We investigate how acceleration influences the transfer of persistent currents between two density-connected, ring-shaped atomic Bose-Einstein condensates, joined by a tunable weak link that controls system topology. We find that the acceleration of this system modifies both the density and phase dynamics between the rings, leading to a bias in the periodic vortex oscillations studied in T. Bland et al., Phys. Rev. Research 4, 043171 (2022). Accounting for dissipation suppressing such vortex oscillations, the acceleration facilitates a unilateral vortex transfer to the leading ring. We analyze how this transfer depends on the weak-link amplitude, the initial persistent current configuration, and the acceleration strength and direction. Characterization of the sensitivity to these parameters paves the way for a new platform for acceleration measurements, for which we outline a proof-of-concept ultracold double-ring accelerometer.Persistent currents–inviscid quantized flow around an atomic circuit–are a crucial building block of atomtronic devices. We investigate how acceleration influences the transfer of persistent currents between two density-connected, ring-shaped atomic Bose-Einstein condensates, joined by a tunable weak link that controls system topology. We find that the acceleration of this system modifies both the density and phase dynamics between the rings, leading to a bias in the periodic vortex oscillations studied in T. Bland et al., Phys. Rev. Research 4, 043171 (2022). Accounting for dissipation suppressing such vortex oscillations, the acceleration facilitates a unilateral vortex transfer to the leading ring. We analyze how this transfer depends on the weak-link amplitude, the initial persistent current configuration, and the acceleration strength and direction. Characterization of the sensitivity to these parameters paves the way for a new platform for acceleration measurements, for which we outline a proof-of-concept ultracold double-ring accelerometer.

arXiv:2410.23818SciPost PhysicsJul 2, 20254 citations

Strange behavior of persistent currents in small Hubbard rings

Santanu K. Maiti, Jayeeta Chowdhury, Samit Karmakar

arXiv:cond-mat/0310556Physics Letters AOct 21, 200431 citations

Persistent current formation in double-ring geometries

T Bland, Quentin Marolleau, P. Comaron +2 more

Abstract Quenching an ultracold bosonic gas in a ring across the Bose–Einstein condensation phase transition is known, and has been experimentally observed, to lead to the spontaneous emergence of persistent currents. The present work examines how these phenomena generalize to a system of two experimentally accessible explicitly two-dimensional co-planar rings with a common interface, or to the related lemniscate geometry, and demonstrates an emerging independence of winding numbers across the rings, which can exhibit flow both in the same and in opposite directions. The observed persistence of such findings in the presence of dissipative coupled evolution due to the local character of the domain formation across the phase transition and topological protection of the randomly emerging winding numbers should be within current experimental reach.Abstract Quenching an ultracold bosonic gas in a ring across the Bose–Einstein condensation phase transition is known, and has been experimentally observed, to lead to the spontaneous emergence of persistent currents. The present work examines how these phenomena generalize to a system of two experimentally accessible explicitly two-dimensional co-planar rings with a common interface, or to the related lemniscate geometry, and demonstrates an emerging independence of winding numbers across the rings, which can exhibit flow both in the same and in opposite directions. The observed persistence of such findings in the presence of dissipative coupled evolution due to the local character of the domain formation across the phase transition and topological protection of the randomly emerging winding numbers should be within current experimental reach.

arXiv:1911.12802Journal of Physics B Atomic Molecular and Optical PhysicsMar 20, 202022 citations

Strange behavior of persistent currents in mesoscopic Hubbard rings

Santanu K. Maiti, Jayeeta Chowdhury, Samit Karmakar

Oct 23, 20030 citations

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