Vortices in Superfluid Fermi Gases through the BEC to BCS Crossover

Abstract

We have analyzed a single vortex at T=0 in a 3D superfluid atomic Fermi gas across a Feshbach resonance. On the BCS side, the order parameter varies on two scales: $k_F^{-1}$ and the coherence length $\xi$, while only variation on the scale of $\xi$ is seen away from the BCS limit. The circulating current has a peak value $j_{max}$ which is a non-monotonic function of $1/k_F{a}_s$ implying a maximum critical velocity $\sim v_F$ at unitarity. The number of fermionic bound states in the core decreases as we move from the BCS to BEC regime. Remarkably, a bound state branch persists even on the BEC side reflecting the composite nature of bosonic molecules.

4 Pages, 4 Figures

References in corpus (2)

• Vortices and Superfluidity in a Strongly Interacting Fermi Gas
• Microscopic Structure of a Vortex Line in a Superfluid Fermi Gas

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