Superfluid current disruption in a chain of weakly coupled Bose–Einstein condensates

F S Cataliotti, L Fallani, F Ferlaino, C Fort, P Maddaloni, M Inguscio
2003 New Journal of Physics  
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"
more » ... ("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.
doi:10.1088/1367-2630/5/1/371 fatcat:m6jp7532qnar3ksyzxlrsdjmnm