Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2009-03-14
Physics
Condensed Matter
Other Condensed Matter
Updated version. A discussion of an analytic criterion for the instability of the superfluid is added. The case of vortex anti
Scientific paper
We study superfluid dissipation due to phase slips for a BEC flowing through a repulsive barrier inside a torus. The barrier is adiabatically raised across the annulus while the condensate flows with a finite quantized angular momentum. At a critical height, a vortex moves from the inner region and reaches the barrier to eventually circulate around the annulus. At a higher critical height, an anti-vortex also enters into the torus from the outer region. Both vortex and anti-vortex decrease the total angular momentum by leaving behind a $2\pi$ phase slip. When they collide and annihilate or orbit along the same loop, the condensate suffers a global $2\pi$ phase slip, and the total angular momentum decreases by one quantum. In hydrodynamic regime, the instability sets in when the local superfluid velocity equals the sound speed inside the barrier region.
Collins Lee A.
Piazza Francesco
Smerzi Augusto
No associations
LandOfFree
Vortex-Induced Phase Slip Dissipation in a Toroidal Bose-Einstein Condensate Flowing Through a Barrier does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Vortex-Induced Phase Slip Dissipation in a Toroidal Bose-Einstein Condensate Flowing Through a Barrier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vortex-Induced Phase Slip Dissipation in a Toroidal Bose-Einstein Condensate Flowing Through a Barrier will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-235917