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VOLUME 85, NUMBER 14 P H Y S I C A L R E V I E W L E T T E R S 2 OCTOBER 2000 Vortex Precession in Bose-Einstein Condensates: Observations with Filled
 

Summary: VOLUME 85, NUMBER 14 P H Y S I C A L R E V I E W L E T T E R S 2 OCTOBER 2000
Vortex Precession in Bose-Einstein Condensates: Observations with Filled
and Empty Cores
B. P. Anderson,* P. C. Haljan, C. E. Wieman, and E. A. Cornell*
JILA, National Institute of Standards and Technology and Department of Physics, University of Colorado,
Boulder, Colorado 80309-0440
(Received 19 May 2000)
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 87
Rb,
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.
PACS numbers: 03.75.Fi, 67.90.+z, 67.57.Fg, 32.80.Pj
The dynamics of quantized vortices in superfluid helium
and superconductors have been fascinating and important
research areas in low-temperature physics [1,2]. Even at
zero temperature, vortex motion within a superfluid is

  

Source: Anderson, Brian P. - Optical Sciences Center, University of Arizona

 

Collections: Physics