Elementary excitations in dipolar spin-1 Bose-Einstein condensates

Details Elementary excitations in dipolar spin-1 Bose-Einstein condensates Elementary excitations in dipolar spin-1 Bose-Einstein condensates

2011-07-11

arxiv.org/abs/1107.2061v2

Phys. Rev. A 84, 043638 (2011)

Physics

Condensed Matter

Quantum Gases

7 pages, 4 figures

Scientific paper

10.1103/PhysRevA.84.043638

We have numerically solved the low-energy excitation spectra of ferromagnetic Bose-Einstein condensates subject to dipolar interparticle interactions. The system is assumed to be harmonically confined by purely optical means, thereby maintaining the spin degree of freedom of the condensate order parameter. Using a zero-temperature spin-1 model, we solve the Bogoliubov excitations for different spin textures, including a spin-vortex state in the absence of external magnetic fields and a rapidly rotating polarized spin texture in a finite homogeneous field. In particular, we consider the effect of dipolar interactions on excitations characteristic of ferromagnetic condensates. The energies of spin waves and magnetic quadrupole modes are found to increase rapidly with the dipolar coupling strength, whereas the energies of density oscillations change only slightly.

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