Meron ground state of Rashba spin-orbit-coupled dipolar bosons

Phys Rev Lett. 2013 Nov 1;111(18):185303. doi: 10.1103/PhysRevLett.111.185303. Epub 2013 Oct 30.

Abstract

We study the effects of dipolar interactions on a Bose-Einstein condensate with synthetically generated Rashba spin-orbit coupling. The dipolar interaction we consider includes terms that couple spin and orbital angular momentum in a way perfectly congruent with the single-particle Rashba coupling. We show that this internal spin-orbit coupling plays a crucial role in the rich ground-state phase diagram of the trapped condensate. In particular, we predict the emergence of a thermodynamically stable ground state with a meron spin configuration.