Structural instabilities of vortices in Bose-Einstein condensates
J.J. García-Ripoll, G. Molina-Terriza, V.M. Pérez-García, L. Torner
Physical Review Letters, 87, 140403 (2001).
MOLAB authors
In this paper we study a gaseous Bose-Einstein condensate and show the following: (i) A minimum value of the interaction is needed for the existence of stable persistent currents. (ii) Vorticity is not a fundamental invariant of the system, as there exists a conservative mechanism which can destroy a vortex and change its sign. (iii) This mechanism is suppressed by strong interactions.