Josephson Current Counterflow in Atomic Bose-Einstein Condensates
摘要
Josephson weak links in superconductors can be engineered such that the phase difference across the junction is (-junction),leading to the reversal of the current. The conditions under which the analogous effect of supercurrent counterflow can be achieved in a double-well atomic Bose-Einstein condensate are investigated. It is shown that this effect is observable for condensates up to a few thousand atoms, which are initially prepared in an anti-symmetric '-state' and subsequently subjected to a uniformly increasing magnetic field gradient. This effect is found to be only weakly-dependent on trap geometry, and can be observed in both attractive and repulsive condensates.
引用
@article{arxiv.cond-mat/0308104,
title = {Josephson Current Counterflow in Atomic Bose-Einstein Condensates},
author = {E. Sakellari and N. P. Proukakis and M. Leadbeater and C. S. Adams},
journal= {arXiv preprint arXiv:cond-mat/0308104},
year = {2007}
}
备注
A substantially revised manuscript (some figures removed, improved discussion and some additional material) is available on cond-mat/0312396