Implementation of an atomtronic SQUID in a strongly confined toroidal condensate

TL;DR

This paper demonstrates the implementation of an atomtronic SQUID using a quasi-1D toroidal condensate with mobile barriers, showing flux-dependent oscillations analogous to electronic SQUIDs, and explores optimal parameters for operation.

Contribution

It introduces a multi-band truncated Wigner approximation simulation of an atomtronic SQUID, revealing flux-dependent oscillations and phase slip dynamics in a strongly confined condensate.

Findings

Flux-dependent oscillations observed in the chemical potential imbalance.

Parameter regimes identified for barrier heights and relaxation times.

Realistic protocol proposed for atomtronic SQUID operation.

Abstract

We investigate the dynamics of an atomtronic SQUID created by two mobile barriers, moving at two different, constant velocities in a quasi-1D toroidal condensate. We implement a multi-band truncated Wigner approximation numerically, to demonstrate the functionality of a SQUID reflected in the oscillatory voltage-flux dependence. The relative velocity of the two barriers results in a chemical potential imbalance analogous to a voltage in an electronic system. The average velocity of the two barriers corresponds to a rotation of the condensate, analogous to a magnetic flux. We demonstrate that the voltage equivalent shows characteristic flux-dependent oscillations. We point out the parameter regime of barrier heights and relaxation times for the phase slip dynamics, resulting in a realistic protocol for atomtronic SQUID operation.