Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2008-12-08
Phys. Rev. A 79, 023618 (2009) [Virtual Journal of Nanoscale Science & Technology 19, 9 (2009)]
Physics
Condensed Matter
Other Condensed Matter
11 pages, 9 figures
Scientific paper
10.1103/PhysRevA.79.023618
The low lying excitations of coreless vortex states in F = 1 spinor Bose-Einstein condensates (BECs) are theoretically investigated using the Gross-Pitaevskii and Bogoliubov-de Gennes equations. The spectra of the elementary excitations are calculated for different spin-spin interaction parameters and ratios of the number of particles in each sublevel. There exist dynamical instabilities of the vortex state which are suppressed by ferromagnetic interactions, and conversely, enhanced by antiferromagnetic interactions. In both of the spin-spin interaction regimes, we find vortex splitting instabilities in analogy with scalar BECs. In addition, a phase separating instability is found in the antiferromagnetic regime.
Machida Kazushige
Mizushima Takeshi
Mottonen Mikko
Pietilä Ville
Takahashi Minoru
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