Resonant persistent currents for ultracold bosons on a lattice ring
arXiv:1710.08777 · doi:10.1103/PhysRevA.96.063616
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.
8 pages, 7 figures; added refs and Editors' teaser
References in corpus (9)
- Quench-induced supercurrents in an annular Bose gas
- Interferometric measurement of the current-phase relationship of a superfluid weak link
- Coherent superposition of current flows in an Atomtronic Quantum Interference Device
- The insulating phases and superfluid-insulator transition of disordered boson chains
- Many-body quantum coherence and interaction blockade in Josephson-linked Bose-Einstein condensates
- Fragmented condensation in Bose-Hubbard trimers with tunable tunnelling
- Superfluidity in Bose-Hubbard circuits
- The single-atom box: bosonic staircase and effects of parity
- Site-wise manipulations and Mott insulator-superfluid transition of interacting photons using superconducting circuit simulators