Collision of Bose-Einstein Condensates

Zahra Haghshenasfard, M. H. Naderi, M. Soltanolkotabi

In this paper, we investigate the spectrum of light scattered from a Bose-Einstein condensate in the framework of -deformed boson.We use an -deformed quantum model in which the Gardiner's phonon operators for BEC are deformed by an operator-valued function,, of the particle-number operator n .We consider the collisions between the atoms as a special kind of -deformation.The collision rateκ is regarded as the deformation parameter and the spectrum of light scattered from the deformed BEC is analyzed.In particular, we find that with increasing the values of deformation parameters κ and N 1 = η ( , total number of condensate atoms) the scattering spectrum shows deviation from the spectrum associated with nondeformed Bose-Einstein condensate.

Masahiro O. Takahashi

Joseph V. Pulé

J. Stenger, S. Inouye, Michael R. Andrews +3 more

The properties of Bose-Einstein condensed gases can be strongly altered by tuning the external magnetic field near a Feshbach resonance. Feshbach resonances affect elastic collisions and lead to the observed modification of the scattering length. However, as we report here, the observed rate of inelastic collisions was strongly enhanced in a sodium Bose-Einstein condensate when the scattering length was tuned to both larger or smaller values than the off-resonant value. These strong losses impose severe limitations for using Feshbach resonances to tune the properties of Bose-Einstein condensates.

Duan Wen-Shan

Head-on collisions between two solitary waves(e.i.solitons) in a disk-shaped Bose-Einstein condensate(BEC) are investigated by using the extended PLK method.Two dark solitons in the system can be described by two KdV equations,their phase shifts are obtained.Based on the comparisons between a disk-shaped BEC and a cigar-shaped BEC,it is found that the values of phase shifts after head-on collision in the two cases are approximately equivalent when the wave number tends to 1.

Wu‐Ming Liu