Volume 84, Number 6, December 2008
Article Number 60005
Number of page(s) 5
Section General
Published online 12 January 2009
EPL, 84 (2008) 60005
DOI: 10.1209/0295-5075/84/60005

Spin mixing in colliding spinor condensates: Formation of an effective barrier

M. Guilleumas1, B. Juliá-Díaz1, J. Mur-Petit2 and A. Polls1

1   Departament d'Estructura i Constituents de la Matèria, Universitat de Barcelona - E-08028 Barcelona, Spain, EU
2   Department of Physics and Astronomy, University College London - London WC1E 6BT, UK, EU

received 14 August 2008; accepted in final form 19 November 2008; published December 2008
published online 12 January 2009

The dynamics of F = 1 spinor condensates initially prepared in a double-well potential is studied in the mean-field approach. It is shown that a small seed of m = 0 atoms on a system with initially well-separated m = 1 and m = -1 condensates has a dramatic effect on their mixing dynamics, acting as an effective barrier for a remarkably long time. We show that this effect is due to the spinor character of the system, and provides an observable example of the interplay between the internal spin dynamics and the macroscopic evolution of the magnetization in a spinor Bose-Einstein condensate.

03.75.Mn - Multicomponent condensates; spinor condensates.
03.75.Kk - Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow.
03.75.Lm - Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations.

© EPLA 2008