Harvard Condensed Matter Theory Seminars
We study the evolution of the structure of a single vortex
across the BCS-BEC Crossover. We find that the maximum
current flowing around the vortex, the critical current, is
non-monotonic across the crossover and shows a peak at
unitarity. We understand this in terms of Landau's criterion
for critical velocities in a superfluid. Unitarity thus
represents the most robust superfluid in the entire
crossover. We also find that the Fermionic bound states in
the vortex core persist deep into the BEC regime.
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