Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2002-05-27
J. Phys.: Condens. Matter 14 No 49 (16 December 2002) 13481-13491
Physics
Condensed Matter
Statistical Mechanics
12 pages, 8 figures
Scientific paper
It is shown that a vortex can be continuously created in a Bose-Einstein condensate with hyperfine spin F=2 in a Ioffe-Pritchard trap by reversing the axial magnetic field adiabatically. It may be speculated that the condensate cannot be confined in the trap since the weak-field seeking state makes transitions to the neutral and the strong-field seeking states due to the degeneracy of these states along the vortex axis when the axial field vanishes. We have solved the Gross-Pitaevskii equation numerically with given external magnetic fields to show that this is not the case. It is shown that a considerable fraction of the condensate remains in the trap even when the axial field is reversed rather slowly. This scenario is also analysed in the presence of an optical plug along the vortex axis. Then the condensate remains within the $F_z=2$ manifold, with respect to the local magnetic field, throughout the formation of a vortex and hence the loss of atoms does not take place.
Matsumoto Naoki
Mottonen Mikko
Nakahara Mikio
Ohmi Tetsuo
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