title: Anisotropic and long-range vortex interactions in two-dimensional dipolar Bose gases.
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.
authors.affiliation: School of Physics, University of Melbourne, Victoria 3010, Australia.
authors.forename: B C
authors.initials: BC
authors.lastname: Mulkerin
authors.forename: R M W
authors.initials: RM
authors.lastname: van Bijnen
authors.forename: D H J
authors.initials: DH
authors.lastname: O'Dell
authors.forename: A M
authors.initials: AM
authors.lastname: Martin
authors.forename: N G
authors.initials: NG
authors.lastname: Parker