Artículos de revistas
Route to turbulence in a trapped Bose-Einstein condensate
Fecha
2011Registro en:
LASER PHYSICS LETTERS, v.8, n.9, p.691-696, 2011
1612-2011
10.1002/lapl.201110052
Autor
SEMAN, J. A.
HENN, E. A. L.
SHIOZAKI, R. F.
ROATI, G.
POVEDA-CUEVAS, F. J.
FARIAS, Kilvia Mayre
YUKALOV, V. I.
TSUBOTA, M.
KOBAYASHI, M.
KASAMATSU, K.
BAGNATO, Vanderlei Salvador
Institución
Resumen
We have studied a Bose-Einstein condensate of (87)Rb atoms under an oscillatory excitation. For a fixed frequency of excitation, we have explored how the values of amplitude and time of excitation must be combined in order to produce quantum turbulence in the condensate. Depending on the combination of these parameters different behaviors are observed in the sample. For the lowest values of time and amplitude of excitation, we observe a bending of the main axis of the cloud. Increasing the amplitude of excitation we observe an increasing number of vortices. The vortex state can evolve into the turbulent regime if the parameters of excitation are driven up to a certain set of combinations. If the value of the parameters of these combinations is exceeded, all vorticity disappears and the condensate enters into a different regime which we have identified as the granular phase. Our results are summarized in a diagram of amplitude versus time of excitation in which the different structures can be identified. We also present numerical simulations of the Gross-Pitaevskii equation which support our observations. (C) 2011 by Astro Ltd. Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA