# Oscillations and decay of superfluid currents in a one-dimensional Bose gas on a ring

## TL;DR

This paper investigates the complex dynamics of superfluid currents in a one-dimensional Bose gas on a ring, revealing oscillations, decay, and self-trapping behaviors influenced by interactions and temperature, modeled via a dual Josephson framework.

## Contribution

It introduces a dual Josephson model to describe supercurrent dynamics in a 1D Bose gas with a defect, highlighting the roles of thermal and quantum phase slips.

## Key findings

- Identification of regimes with oscillating, decaying, or self-trapped currents
- Demonstration of phase slips as key mechanisms in current decay
- Validation of the dual Josephson model for describing the dynamics

## Abstract

We study the time evolution of a supercurrent imprinted on a one-dimensional ring of interacting bosons in the presence of a defect created by a localized barrier. Depending on interaction strength and temperature, we identify various dynamical regimes where the current oscillates, is self-trapped or decays with time. We show that the dynamics are captured by a dual Josephson model and involve phase slips of thermal or quantum nature.