Normal-Superfluid Interface Scattering for Polarized Fermion Gases

Schaeybroeck, Bert Van; Lazarides, Achilleas

doi:10.1103/physrevlett.98.170402

Cited by 32 publications

(49 citation statements)

References 21 publications

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“…These experiments confirm the theoretical proposal of Parish and Huse [151], who showed that this metastable state could arise due to the elongated trap geometry, in which evaporation occurs predominantly from the trap center. Once phase separation occurs in this geometry, particle and heat transport are suppressed at the narrow interface between the gapped superfluid core and the normal outer region [152,153,151]. It turns out that the resulting evaporative depolarization of the central core stabilizes superfluidity, and thus favors the superfluid phase over the normal phase, even when the overall polarization of the gas is above the expected critical imbalance.…”

Section: Experimental Overviewmentioning

confidence: 97%

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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Section: Experimental Overviewmentioning

confidence: 97%

Imbalanced Fermi gases at unitarity

2013

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“…Consider an incoming a-particle from the N side with energy E > ξ (p) − µ a , where or k from real to imaginary values (or vice versa), signifying a change in the scattering mechanism as described below [30,31]: i) For E < ∆ − h, the incoming particle has insufficient energy to excite the SF side. In this case we have total reflection.…”

Section: Transmission Coefficientsmentioning

confidence: 99%

“…β ), where κ (0) is the heat conductivity in the absence of the external field and κ (1) is the additional term due to the [30]), which we neglect. Also, in our calculations we have neglected the energy carried by the β-channel because it is quite lower than that carried by the α-channel.…”

Section: Heat Conductivitymentioning

confidence: 99%

“…Such a phase-separation scenario had been proposed by Clogston [27] and Chandrasekhar [28] long ago, who predicted the occurrence of a first-order transition from the N to the SF state. Since the existence of a N-SF interface may settle some important questions regarding polarized Fermi mixtures, serious research has been focused on this subject [29][30][31]33]. In particular, it has been established [30,31] that a temperature difference between the two phases can appear as a consequence of the blockage of energy transfer across the N-SF interface.…”

Section: Introductionmentioning

confidence: 99%

“…Since the existence of a N-SF interface may settle some important questions regarding polarized Fermi mixtures, serious research has been focused on this subject [29][30][31]33]. In particular, it has been established [30,31] that a temperature difference between the two phases can appear as a consequence of the blockage of energy transfer across the N-SF interface. This blockage is due to a SF gap, which causes low-energy normal particles to be reflected from the interface.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Linear response of heat conductivity of normal–superfluid interface of a polarized Fermi gas to orbital magnetic field

Ebrahimian

Mehrafarin

Afzali

2012

Physica B: Condensed Matter

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Using perturbed Bogoliubov equations, we study the linear response to a weak orbital magnetic field of the heat conductivity of the normal-superfluid interface of a polarized Fermi gas at sufficiently low temperature. We consider the various scattering regions of the BCS regime and analytically obtain the transmission coefficients and the heat conductivity across the interface in an arbitrary weak orbital field. For a definite choice of the field, we consider various values of the scattering length in the BCS range and numerically obtain the allowed values of the average and species-imbalance chemical potentials. Thus, taking Andreev reflection into account, we describe how the heat conductivity is affected by the field and the species imbalance. In particular, we show that the additional heat conductivity due to the orbital field increases with the species imbalance, which is more noticeable at higher temperatures. Our results indicate how the heat conductivity may be controlled, which is relevant to sensitive magnetic field sensors/regulators at the interface.

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Population imbalance as a vortex catalyst in Fermi superfluids

Tempere

Devreese

2008

Physica C: Superconductivity and its Applications

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Normal-Superfluid Interface Scattering for Polarized Fermion Gases

Cited by 32 publications

References 21 publications

Imbalanced Fermi gases at unitarity

Imbalanced Fermi gases at unitarity

Linear response of heat conductivity of normal–superfluid interface of a polarized Fermi gas to orbital magnetic field

Population imbalance as a vortex catalyst in Fermi superfluids

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