Title: Vortex pairs in a spin-orbit coupled Bose-Einstein condensate,
Abstract: Static and dynamic properties of vortices in a two-component Bose-Einstein
condensate with Rashba spin-orbit coupling are investigated. The mass current
around a vortex core in the plane-wave phase is found to be deformed by the
spin-orbit coupling, and this makes the dynamics of the vortex pairs quite
different from those in a scalar Bose-Einstein condensate. The velocity of a
vortex-antivortex pair is much smaller than that without spin-orbit coupling,
and there exist stationary states. Two vortices with the same circulation move
away from each other or unite to form a stationary state.