Harvard Condensed Matter Theory Seminars

Rajdeep Sensarma, Ohio State University

Vortices, critical currents and Fermionic bound states in BCS-BEC crossover

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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