Instability of superfluid across Feshbach resonances
C.-H. Paoa , Shin-Tza Wua , and Sungkit Yipb
a
b
Department of Physics, National Chung Cheng University, Chiayi 621, Taiwan
Institute of Physics, Academia Sinica, Nankang, Taipei 115, Taiwan
We consider a dilute atomic gas with two species of Fermions with unequal concentrations. We study
at zero temperature the atom-molecule mixture with inter-species low-energy scatterings induced by a
Feshbach resonance. To examine the stability of this superfluid, we calculate the chemical potential and
the superfluid density for fixed individual concentrations. We find that the system can have distinct
properties compared to the ordinary Bose-Fermi mixture due to the unbound fermions.
Sorting category: Aa Quantum gases, fluids and solids
Keywords: superfluidity, BEC-BCS crossover, Bose-Fermi mixture
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