Resonant persistent currents for ultracold bosons on a lattice ring

Abstract

We consider a one-dimensional bosonic gas on a ring lattice, in the presence of a localized barrier, and under the effect of an artificial gauge field. By means of exact diagonalization we study the persistent currents at varying interactions and barrier strength, for various values of lattice filling. While generically the persistent currents are strongly suppressed in the Mott insulator phase, they show a resonant behaviour when the barrier strength becomes of the order of the interaction energy. We explain this phenomenon using an effective single-particle model. We show that this effect is robust at finite temperature, up the temperature scale where persistent currents vanish.

arXiv comment8 pages, 7 figures; added refs and Editors' teaser

References in corpus (19)

• Direct Observation of Second Order Atom Tunnelling
• Driving phase slips in a superfluid atom circuit with a rotating weak link
• Quantised supercurrent decay in an annular Bose-Einstein condensate
• Quench-induced supercurrents in an annular Bose gas
• Counting atoms using interaction blockade in an optical superlattice
• Interferometric measurement of the current-phase relationship of a superfluid weak link
• Optimal Persistent Currents for Interacting Bosons on a Ring with a Gauge Field
• Coherent superposition of current flows in an Atomtronic Quantum Interference Device
• Exact Study of the 1D Boson Hubbard Model with a Superlattice Potential
• The insulating phases and superfluid-insulator transition of disordered boson chains
• Ultracold Bosonic Atoms in Disordered Optical Superlattices
• Many-body quantum coherence and interaction blockade in Josephson-linked Bose-Einstein condensates
• Fragmented condensation in Bose-Hubbard trimers with tunable tunnelling
• Transport and interaction blockade of cold bosonic atoms in a triple-well potential
• Superfluidity in Bose-Hubbard circuits
• The single-atom box: bosonic staircase and effects of parity
• Chaos and two-level dynamics of the Atomtronic Quantum Interference Device
• Site-wise manipulations and Mott insulator-superfluid transition of interacting photons using superconducting circuit simulators
• Robustness of discrete semifluxons in closed Bose-Hubbard chains

Cited by in corpus (8)

• Few-body Bose gases in low dimensions -- a laboratory for quantum dynamics
• Superfluid to Mott transition in a Bose-Hubbard ring: Persistent currents and defect formation
• Effects of a rotating periodic lattice on coherent quantum states in a ring topology: The case of positive nonlinearity
• Static and dynamic phases of a Tonks-Girardeau gas in an optical lattice
• Chaos induced breakdown of Bose-Hubbard modeling
• Rotation Sensitive Quench and Revival of Coherent Oscillations in a Ring Lattice
• Entangled Collective Spin States of Two Species Ultracold atoms in a Ring
• Dynamics of interacting bosons in a two-leg ring ladder with artificial magnetic flux and ac-driven modulations