Vortices in Superfluid Fermi Gases through the BEC to BCS Crossover

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2006-03-09

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American Physical Society

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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 ξ, while only variation on the scale of ξ is seen away from the BCS limit. The circulating current has a peak value j_max which is a nonmonotonic function of 1/k_Fa_s implying a maximum critical velocity ∼vF 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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Rajdeep Sensarma, Mohit Randeria, Tin-Lun Ho, "Vortices in Superfluid Fermi Gases through the BEC to BCS Crossover," Physical Review Letters 96, no. 9 (2006), doi:10.1103/PhysRevLett.96.090403

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http://hdl.handle.net/1811/48084

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Ohio State University Research and Scholarship