Persistent currents in dipolar Bose-Einstein condensates confined in   annular potentials
  We consider a dipolar Bose-Einstein condensate confined in an annular potential, with all the dipoles being aligned along some arbitrary direction. In addition to the dipole-dipole interaction, we also assume a zero-range hard-core potential. We investigate the stability of the system against collapse, as well as the stability of persistent currents as a function of the orientation of the dipoles and of the strength of the hard-core interaction. 
F. Malet, G. M. Kavoulakis, and S. M. Reimann
cond-mat.quant-gas