title: 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 jmax which is a nonmonotonic function of 1/k(F)a(s) implying a maximum critical velocity approximately 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.
authors.affiliation: Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA.
authors.forename: Rajdeep
authors.initials: R
authors.lastname: Sensarma
authors.forename: Mohit
authors.initials: M
authors.lastname: Randeria
authors.forename: Tin-Lun
authors.initials: TL
authors.lastname: Ho