Josephson Current Counterflow in Atomic Bose-Einstein Condensates

Details Josephson Current Counterflow in Atomic Bose-Einstein Condensates Josephson Current Counterflow in Atomic Bose-Einstein Condensates

2003-08-06

arxiv.org/abs/cond-mat/0308104v2

Physics

Condensed Matter

A substantially revised manuscript (some figures removed, improved discussion and some additional material) is available on co

Scientific paper

Josephson weak links in superconductors can be engineered such that the phase difference across the junction is $\pi$ ($\pi$-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 '$\pi$-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.

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