Anisotropic and long-range vortex interactions in two-dimensional dipolar bose gases
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2013-10-22
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Physical Review Letters
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AMER PHYSICAL SOC
Melbourne Authors
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School of Physics
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Journal Article
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Mulkerin, B. C., Van Bijnen, R. M. W., O'Dell, D. H. J., Martin, A. M. & Parker, N. G. (2013). Anisotropic and long-range vortex interactions in two-dimensional dipolar bose gases. Physical Review Letters, 111 (17), https://doi.org/10.1103/PhysRevLett.111.170402.
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Abstract
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 antidipole, changing the density profile and generating an effective dipolar potential centred at the vortex core whose most slowly decaying terms go as 1/ρ(2) and ln(ρ)/ρ(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 corotation dynamics and the suppression of vortex annihilation.