Using two radio frequency pulses separated in time we perform an amplitude division interference experiment on a rubidium Bose-Einstein condensate. The presence of a quantized vortex, which is nucleated by stirring the condensate with a laser beam, is revealed by a dislocation in the fringe pattern.
@article{arxiv.cond-mat/0104545,
title = {Interferometric detection of a single vortex in a dilute Bose-Einstein condensate},
author = {F. Chevy and K. W. Madison and V. Bretin and J. Dalibard},
journal= {arXiv preprint arXiv:cond-mat/0104545},
year = {2009}
}