Physics – Condensed Matter – Quantum Gases
Scientific paper
2009-10-14
Physics
Condensed Matter
Quantum Gases
to appear in JLTP - QFS 2009
Scientific paper
We report on the experimental observation of vortex formation and production of tangled vortex distribution in an atomic BEC of Rb-87 atoms submitted to an external oscillatory perturbation. The oscillatory perturbations start by exciting quadrupolar and scissors modes of the condensate. Then regular vortices are observed finally evolving to a vortex tangle configuration. The vortex tangle is a signature of the presence of a turbulent regime in the cloud. We also show that this turbulent cloud has suppression of the aspect ratio inversion typically observed in quantum degenerate bosonic gases during free expansion.
Bagnato Vanderlei Salvador
Henn E. A. L.
Magalhães K. M. F.
Roati Giacomo
Seman J. A.
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