Journal
JOURNAL OF LOW TEMPERATURE PHYSICS
Volume 140, Issue 5-6, Pages 409-428Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10909-005-7324-3
Keywords
BCS-to-BEC transition; cold Fermi gases; quantum fluids
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We discuss the possibility of a quantum phase transition in ultra-cold spin-polarized Fermi gases which exhibit a p-wave Feshbach resonance. We show that when fermionic atoms form a condensate that can be externally tuned between the BCS and BEC limits, the zero temperature compressibility and the spin susceptibility of the fermionic gas are non-analytic functions of the two-body bound state energy. This non-analyticity is due to a massive rearrangement of the momentum distribution in the ground state of the system. Furthermore, we show that the low temperature superfluid density is also non-analytic and exhibits a dramatic change in behavior when the critical value of the bound state energy is crossed.
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