TY - JOUR
T1 - BCS-BEC Crossover in a Gas of Fermi Atoms with a Feshbach Resonance
AU - Ohashi, Y.
AU - Griffin, A.
PY - 2002
Y1 - 2002
N2 - We discuss the BCS-BEC crossover in a degenerate Fermi gas of two hyperfine states interacting close to a Feshbach resonance. We show that, by including fluctuation contributions to the free energy similar to that considered by Nozières and Schmitt-Rink, the character of the superfluid phase transition continuously changes from the BCS-type to the BEC-type, as the threshold of the quasimolecular band is lowered. In the BEC regime, the superfluid phase transition is interpreted in terms of molecules associated with both the Feshbach resonance and Cooper pairing.
AB - We discuss the BCS-BEC crossover in a degenerate Fermi gas of two hyperfine states interacting close to a Feshbach resonance. We show that, by including fluctuation contributions to the free energy similar to that considered by Nozières and Schmitt-Rink, the character of the superfluid phase transition continuously changes from the BCS-type to the BEC-type, as the threshold of the quasimolecular band is lowered. In the BEC regime, the superfluid phase transition is interpreted in terms of molecules associated with both the Feshbach resonance and Cooper pairing.
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U2 - 10.1103/PhysRevLett.89.130402
DO - 10.1103/PhysRevLett.89.130402
M3 - Article
C2 - 12225012
AN - SCOPUS:0037163794
SN - 0031-9007
VL - 89
JO - Physical Review Letters
JF - Physical Review Letters
IS - 13
ER -