Interacting preformed Cooper pairs in resonant Fermi gases

Gubbels, K. B.; Stoof, H. T. C.

doi:10.1103/physreva.84.013610

Cited by 15 publications

(16 citation statements)

References 51 publications

(127 reference statements)

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“…[3], which is equivalent to the Popov approach for (composite) bosons in the Bose-Einstein condensation (BEC) limit. The good agreement we will obtain by this approach with the experimental data on the compressibility (see below), over the whole temperature range where they are available, indicates that the residual interaction among correlated fermion pairs above T c [4] represents a key ingredient for the thermodynamic stability of the system. For the spin susceptibility, only the DOS diagram of Fig.…”

supporting

confidence: 63%

Density and Spin Response of a Strongly Interacting Fermi Gas in the Attractive and Quasirepulsive Regime

Palestini¹,

Pieri²,

Strinati³

2012

Phys. Rev. Lett.

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Recent experimental advances in ultracold Fermi gases allow for exploring response functions under different dynamical conditions. In particular, the issue of obtaining a "quasirepulsive" regime starting from a Fermi gas with an attractive interparticle interaction while avoiding the formation of the two-body bound state is currently debated. Here, we provide a calculation of the density and spin response for a wide range of temperature and coupling both in the attractive and quasirepulsive regime, whereby the system is assumed to evolve nonadiabatically toward the "upper branch" of the Fermi gas. A comparison is made with the available experimental data for these two quantities.

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supporting

confidence: 63%

Density and Spin Response of a Strongly Interacting Fermi Gas in the Attractive and Quasirepulsive Regime

Palestini¹,

Pieri²,

Strinati³

2012

Phys. Rev. Lett.

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“…To this end, we have to generalize the Wilsonian RG theory for point-like bosons to the more complicated case of Cooper pairs [221]. The inverse propagator for the non-condensed Cooper pairs G −1 ∆ that follows from the quadratic part in the pairing field of Eq.…”

Section: Renormalization Theory For Cooper Pairsmentioning

confidence: 99%

Imbalanced Fermi gases at unitarity

2013

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We consider imbalanced Fermi gases with strong attractive interactions, for which Cooper-pair formation plays an important role. The two-component mixtures consist either of identical fermionic atoms in two different hyperfine states, or of two different atomic species both occupying only a single hyperfine state. In both cases, the number of atoms for each component is allowed to be different, which leads to a spin imbalance, or spin polarization. Two different atomic species also lead to a mass imbalance. Imbalanced Fermi gases are relevant to condensed-matter physics, nuclear physics and astroparticle physics. They have been studied intensively in recent years, following their experimental realization in ultracold atomic Fermi gases. The experimental control in such a system allows for a systematic study of the equation of state and the phase diagram as a function of temperature, spin polarization and interaction strength. In this review, we discuss the progress in understanding strongly-interacting imbalanced Fermi gases, where a main goal is to describe the results of the highly controlled experiments. We start by discussing Feshbach resonances, after which we treat the imbalanced Fermi gas in mean-field theory to give an introduction to the relevant physics. We encounter several unusual superfluid phases, including phase-separation, gapless Sarma superfluidity, and supersolidity. To obtain a more quantitative description of the experiments, we review also more sophisticated techniques, such as diagrammatic methods and the renormalization-group theory. We end the review by discussing two theoretical approaches to treat the inhomogeneous imbalanced Fermi gas, namely the Landau-Ginzburg theory and the Bogoliubov-de Gennes approach.

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“…The natural question is whether the simple BCS mean-field theory can be improved to include interaction effects in the normal state at least approximately. Obviously, there are a lot of extensions of the simple BCS theory [11,12,13,14,15,16,9,17,18,19,20,21] that incorporate fluctuations in the BCS model and can describe the non-superfluid state properly. Most of the methods are however numerically very heavy and the simplicity of the BCS mean-field theory has been lost.…”

Section: Introductionmentioning

confidence: 99%

Hartree shift in unitary Fermi gases

Kinnunen

2012

Phys. Rev. A

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The Hartree energy shift is calculated for a unitary Fermi gas. By including the momentum dependence of the scattering amplitude explicitly, the Hartree energy shift remains finite even at unitarity. Extending the theory also for spin-imbalanced systems allows calculation of polaron properties. The results are in good agreement with more involved theories and experiments.Comment: 31 pages, many figure

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Interacting preformed Cooper pairs in resonant Fermi gases

Cited by 15 publications

References 51 publications

Density and Spin Response of a Strongly Interacting Fermi Gas in the Attractive and Quasirepulsive Regime

Density and Spin Response of a Strongly Interacting Fermi Gas in the Attractive and Quasirepulsive Regime

Imbalanced Fermi gases at unitarity

Hartree shift in unitary Fermi gases

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