# Superfluidity fraction of few bosons in an annular geometry in the presence of a rotating weak link

## TL;DR

This study uses a beyond mean-field approach to analyze superfluidity in a few-boson ring system with a rotating weak link, revealing how barrier height and interaction strength affect superfluidity and condensation.

## Contribution

It applies the Multiconfiguration Hartree Method for bosons to compute superfluidity and density correlations, providing new insights into their dependence on system parameters.

## Key findings

- Superfluidity fraction decreases with increasing barrier height.
- Condensation fraction depends solely on interaction strength.
- Density correlation functions reveal system behavior.

## Abstract

We report a beyond mean-field calculation of mass current and superfluidity fraction for a system of few bosons confined in a ring geometry in the presence of a rotating weak link induced by a potential barrier. We apply the Multiconfiguration Hartree Method for bosons to compute the ground state of the system and show the average superfluidity fraction for a wide range of interaction strength and barrier height, highlighting the behavior of density correlation functions. The decrease of superfluidity fraction due to the increase of barrier height is found whereas the condensation fraction depends exclusively on the interaction strength, showing the independence of both phenomena.