Resonant persistent currents for ultracold bosons on a lattice ring

Geva Arwas, Doron Cohen, Frank Hekking, Anna Minguzzi

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

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 behavior 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.

Original languageEnglish
Article number063616
JournalPhysical Review A
Volume96
Issue number6
DOIs
StatePublished - 19 Dec 2017

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