Twodimensional dynamics of expansion of a degenerate Bose gas
Abstract
Expansion of a degenerate Bose gas released from a pancakelike trap is numerically simulated under the assumption of separation of the motion in the plane of the loose initial trapping and the motion in the direction of the initial tight trapping. The initial conditions for the phase fluctuations are generated using the extension to the twodimensional case of the description of the phase noise by the OrnsteinUhlenbeck stochastic process. The numerical simulations, taking into account both the finite size of the twodimensional system and the atomic interactions, which cannot be neglected on the early stage of expansion, did not reproduce the scaling law for the peaks in the density fluctuation spectra experimentally observed by Choi, Seo, Kwon, and Shin [Phys. Rev. Lett.PRLTAO0031900710.1103/PhysRevLett.109.125301 109, 125301 (2012)]. The latter experimental results may thus require an explanation beyond our current assumptions.
 Publication:

Physical Review A
 Pub Date:
 November 2012
 DOI:
 10.1103/PhysRevA.86.055603
 arXiv:
 arXiv:1210.1813
 Bibcode:
 2012PhRvA..86e5603M
 Keywords:

 67.85.d;
 03.75.Lm;
 03.75.Hh;
 Ultracold gases trapped gases;
 Tunneling Josephson effect BoseEinstein condensates in periodic potentials solitons vortices and topological excitations;
 Static properties of condensates;
 thermodynamical statistical and structural properties;
 Condensed Matter  Quantum Gases
 EPrint:
 4 pages, 2 figures, revtex4