Physical Review Letters
We have observed and characterized the dynamics of singly quantized vortices in dilute-gas Bose-Einstein condensates. Our condensates are produced in a superposition of two internal states of 87Rb, with one state supporting a vortex and the other filling the vortex core. Subsequently, the state filling the core can be partially or completely removed, reducing the radius of the core by as much as a factor of 13, all the way down to its bare value of the healing length. The corresponding superfluid rotation rates, evaluated at the core radius, vary by a factor of 150, but the precession frequency of the vortex core about the condensate axis changes by only a factor of 2.
Anderson, B. P.; Haljan, P. C.; Wieman, Carl E.; and Cornell, Eric A., "Vortex Precession in Bose-Einstein Condensates: Observations with Filled and Empty Cores" (2000). Physics Faculty Contributions. 4.