Journal
PHYSICAL REVIEW LETTERS
Volume 96, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.96.090403
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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 nonmonotonic function of 1/k(F)a(s) implying a maximum critical velocity similar to v(F) at unitarity. The number of fermionic bound states in the core decreases as we move from the BCS to the BEC regime. Remarkably, a bound state branch persists even on the BEC side reflecting the composite nature of bosonic molecules.
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