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Anisotropic and Long-Range Vortex Interactions in Two-Dimensional Dipolar Bose Gases

2013; American Physical Society; Volume: 111; Issue: 17 Linguagem: Inglês

10.1103/physrevlett.111.170402

1092-0145

Brendan C. Mulkerin, Rick van Bijnen, D. H. J. O’Dell, A. Martin, N. G. Parker,

Physics of Superconductivity and Magnetism

We perform a theoretical study into how dipole-dipole interactions modify the properties of superfluid vortices within the context of a two-dimensional atomic Bose gas of co-oriented dipoles. The reduced density at a vortex acts like a giant anti-dipole, changing the density profile and generating an effective dipolar potential centred at the vortex core whose most slowly decaying terms go as $1/\rho^2$ and $\ln(\rho)/\rho^3$. These effects modify the vortex-vortex interaction which, in particular, becomes anisotropic for dipoles polarized in the plane. Striking modifications to vortex-vortex dynamics are demonstrated, i.e. anisotropic co-rotation dynamics and the suppression of vortex annihilation.