Vortices in Superfluid Fermi Gases through the BEC to BCS Crossover

Journal Article · Fri Mar 10 00:00:00 EST 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.96.0· OSTI ID:20778764

Sensarma, Rajdeep; Randeria, Mohit; Ho, T -L ^[1]

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1. Department of Physics, Ohio State University, Columbus, Ohio 43210 (United States)

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{sub F}{sup -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{sub max} which is a nonmonotonic function of 1/k{sub F}a{sub s} implying a maximum critical velocity {approx}v{sub 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.

• OSTI ID: 20778764
• Journal Information: Physical Review Letters, Vol. 96, Issue 9; Other Information: DOI: 10.1103/PhysRevLett.96.090403; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BCS THEORY
BOSE-EINSTEIN CONDENSATION
BOUND STATE
COHERENCE LENGTH
CRITICAL VELOCITY
FERMI GAS
FERMIONS
FUNCTIONS
ORDER PARAMETERS
RESONANCE
SUPERFLUIDITY
UNITARITY
VORTICES