Manipulating Bose-Einstein condensed atoms in toroidal traps

TL;DR

This paper explores how tiny changes in a toroidal trap's potential can control the density distribution of Bose-Einstein condensed atoms, enabling external manipulation and highlighting sensitivity to trap irregularities.

Contribution

It demonstrates the exponential localization/delocalization of atom density in toroidal traps under one-dimensional conditions, revealing a method for external control.

Findings

Density can be exponentially localized or delocalized with small potential variations.

Minor trap irregularities significantly affect atom density.

External potential modifications enable control over atom distribution.

Abstract

We consider Bose-Einstein condensed atoms confined in a toroidal trap. We demonstrate that under conditions of one-dimensional behavior, the density distribution of the atoms may be exponentially localized/delocalized, even for very small variations in the trapping potential along the torus. This observation allows one to control the atom density externally via slight modifications of the trapping potential. For similar reasons, small irregularities of the trap may also have a very pronounced effect on the density of the cloud.