Superfluid current disruption in a chain of weakly coupled Bose-Einstein Condensates

Details Superfluid current disruption in a chain of weakly coupled Bose-Einstein Condensates Superfluid current disruption in a chain of weakly coupled Bose-Einstein Condensates

2003-11-18

arxiv.org/abs/cond-mat/0311410v1

New Journal of Physics 5, 71 (2003)

Physics

Condensed Matter

Soft Condensed Matter

8 pages, 4 figures

Scientific paper

10.1088/1367-2630/5/1/371

We report the experimental observation of the disruption of the superfluid atomic current flowing through an array of weakly linked Bose-Einstein condensates. The condensates are trapped in an optical lattice superimposed on a harmonic magnetic potential. The dynamical response of the system to a change of the magnetic potential minimum along the optical lattice axis goes from a coherent oscillation (superfluid regime) to a localization of the condensates in the harmonic trap ("classical" insulator regime). The localization occurs when the initial displacement is larger than a critical value or, equivalently, when the velocity of the wavepacket's center of mass is larger than a critical velocity dependent on the tunnelling rate between adjacent sites.

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