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

by F. S. Cataliotti, L. Fallani, F. Ferlaino, C. Fort, P. Maddaloni, M. Inguscio
Abstract:
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 centre of mass is larger than a critical velocity dependent on the rate of tunnelling between adjacent sites.publisher=IOP Publishing
Reference:
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,
New Journal of Physics, 5, 71, 2003.
Bibtex Entry:
@article{1367-2630-5-1-371,
  title = {Superfluid current disruption in a chain of weakly coupled Bose–Einstein condensates},  
  author = {Cataliotti, F. S. and Fallani, L. and Ferlaino, F. and Fort, C. and Maddaloni, P. and Inguscio, M.},
  journal = {New Journal of Physics},
  volume = {5},
  number = {1},
  pages = {71},
  year = {2003},
  month = {Jun},
  abstract = {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 centre of mass is larger than a critical velocity dependent on the rate of tunnelling between adjacent sites.}
  publisher = {IOP Publishing}, 
  url = {http://stacks.iop.org/1367-2630/5/i=1/a=371},
  arXiv = {http://arxiv.org/abs/cond-mat/0311410}
}