The Nature of Superfluidity in Ultracold Fermi Gases Near Feshbach Resonances
Jelena Stajic, J. N. Milstein, Qijin Chen, M. L. Chiofalo, M. J., Holland, K. Levin
TL;DR
This paper investigates the superfluidity in ultracold Fermi gases near Feshbach resonances, highlighting the role of non-condensed fermion pairs and their impact on experimental observations.
Contribution
It introduces a BCS-BEC crossover theory emphasizing non-condensed pairs and their hybridization with molecular bosons, revealing pseudogap effects and non-BCS behavior.
Findings
Identification of pseudogap effects above Tc
Demonstration of non-BCS characteristics below Tc
Analysis of experimental signatures of superfluidity
Abstract
We study the superfluid state of atomic Fermi gases using a BCS-BEC crossover theory. Our approach emphasizes non-condensed fermion pairs which strongly hybridize with their (Feshbach-induced) molecular boson counterparts. These pairs lead to pseudogap effects above and non-BCS characteristics below. We discuss how these effects influence the experimental signatures of superfluidity.
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Taxonomy
TopicsCold Atom Physics and Bose-Einstein Condensates · Quantum, superfluid, helium dynamics · Physics of Superconductivity and Magnetism