Universal Phase Diagram and Scaling Functions of Imbalanced Fermi Gases

Frank, B.; Lang, Johannes; Zwerger, W.

doi:10.1134/s1063776118110031

Cited by 38 publications

(63 citation statements)

References 58 publications

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“…which is between the values found by Frank et al [38], which obtained (δµ/µ) c = 1.09, Lobo et al [34], that found (δµ/µ) c = 0.96, and Boettcher et al, which found (δµ/µ) c = 0.83 [37]. The (δµ/µ) c from Eq.…”

Section: Effect Of Interactions In the Normal Phasesupporting

confidence: 82%

“…As mentioned in Ref. [38], a very important, and still open issue, is the precise nature of the ground state in the regime h c < h < h s . As plans for a future work, we intent to investigate the possible phases that may arise in this adverse and, at the same time, intriguing regime, and the respective phase transitions associated to them.…”

Section: Discussionmentioning

confidence: 99%

“…[25] by a different manner: −0.62 < η c2 < −0.61. The ratio η c2 fixes the corresponding saturation field (h/µ) s [38] h µ s = 1 − η c2 1 + η c2 = 4.19.…”

Section: Effect Of Interactions In the Normal Phasementioning

confidence: 99%

“…The "effective" fields and order of the quantum phase transitions are h c /µ = 0.79, a first-order phase transition from the unpolarized SF to a PP normal phase, h s /µ = 1.06, a second-order phase transition from the PP to the FP normal phase [22,40], and the maximum field which sets the transition from FP normal phase to the vacuum, h m /µ = 1.41, which is also of second-order. [35] 0.808 FRG [37] 0.83 This work, SPM and DFE 0.88 0.79 QMC [34] 0.96 ǫ = 4 − d expansion [36] 1.15 QMC [30] 1.22 LW formalism [38] 1.09 Experiments [22] 0.95 Experiments [18] 0.878…”

Section: Equilibrium In Trapped Systemsmentioning

confidence: 99%

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Superfluid-normal quantum phase transitions in an imbalanced Fermi gas

Caldas¹

2020

J. Phys. B: At. Mol. Opt. Phys.

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We investigate the superfluid-to-normal zero temperature quantum phase transitions of asymmetric two-component Fermi gases as a function of the chemical potential imbalance h. The calculations are performed for homogeneous and trapped imbalanced systems. We concentrate at unitarity, characterized by a divergent interaction parameter kF a, where most of the current experiments are realized. For homogeneous systems, we determine the critical chemical potential imbalance hc at which possible phase transitions occur. In the case of trapped gases, we show how hc can be consistently determined from experimental observations.

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Section: Effect Of Interactions In the Normal Phasesupporting

confidence: 82%

Section: Discussionmentioning

confidence: 99%

“…[25] by a different manner: −0.62 < η c2 < −0.61. The ratio η c2 fixes the corresponding saturation field (h/µ) s [38] h µ s = 1 − η c2 1 + η c2 = 4.19.…”

Section: Effect Of Interactions In the Normal Phasementioning

confidence: 99%

Section: Equilibrium In Trapped Systemsmentioning

confidence: 99%

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Superfluid-normal quantum phase transitions in an imbalanced Fermi gas

Caldas¹

2020

J. Phys. B: At. Mol. Opt. Phys.

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“…The large mass difference makes double quantum wells in GaAs a solid state system uniquely suitable for generating and enhancing exotic superfluid phases that span the BCS-BEC crossover [19]. Such phases can also be expected in massimbalanced ultracold atomic gas Fermi mixtures [20], but only at currently inaccessible temperatures [21], T c 50 nK. The phases include the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase [22] and the Sarma phase with two Fermi surfaces (breached pair phase) [23].…”

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confidence: 99%

Experimental conditions for the observation of electron-hole superfluidity in GaAs heterostructures

et al. 2020

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The experimental parameter ranges needed to generate superfluidity in optical and drag experiments in GaAs double quantum wells are determined, using a formalism that includes self-consistent screening of the Coulomb pairing interaction in the presence of the superfluid. The very different electron and hole masses in GaAs make this a particularly interesting system for superfluidity, with exotic superfluid phases predicted in the BCS-BEC crossover regime. We find that the density and temperature ranges for superfluidity cover the range for which optical experiments have observed indications of superfluidity, but that existing drag experiments lie outside the superfluid range. However we also show that for samples with low mobility with no macroscopically connected superfluidity, if the superfluidity survived in randomly distributed localized pockets, standard quantum capacitance measurements could detect these pockets.While Bose Einstein Condensation (BEC) and the BCS-BEC crossover phenomena in superfluidity have been extensively studied for ultracold Fermi atoms[1-3], it is probable that practical applications will instead be based on superfluidity in solid state devices. Existence of superfluidity in coupled atomically-flat layers in semiconductor heterostructures has been theoretically predicted [4,5], while recent observations of dramatically enhanced tunneling at equal densities in electron-hole double bilayer sheets of graphene [6,7] and in double monolayers of transition metal dichalcogenide monolayers [8,9] are strong experimental indications for electron-hole condensation [10].Electron-hole superfluidity and the BCS-BEC crossover was first proposed for an excitonic system in a conventional semiconductor heterostructure of double quantum-wells in GaAs[11]. This was based on extensions of earlier work on exciton condensation [12][13][14][15]. To block electron-hole recombination, Refs. 14, 15 proposed spatially separating the electrons and holes in a heterostructure consisting of two layers separated by an insulating barrier. Superfluidity in GaAs quantum-wells differs in significant ways from superfluidity in coupled atomically-flat layers. The large band gap in GaAs eliminates the multicondensate effects and multiband screening that are important in graphene [16], and the low-lying conduction and valence bands are nearly parabolic, and not dependent on gate potentials. arXiv:1910.06631v1 [cond-mat.supr-con]

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The Gor'kov and Melik‐Barkhudarov Correction to the Mean‐Field Critical Field Transition to Fulde–Ferrell–Larkin–Ovchinnikov States

Caldas

Chen

2020

Annalen der Physik

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The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) states, characterized by Cooper pairs condensed at finite-momentum are, at the same time, exotic and elusive. It is partially due to the fact that the FFLO states allow superconductivity to survive even in strong magnetic fields at the mean-field level. The effects of induced interactions at zero temperature are calculated in both clean and dirty cases, and it is found that the critical field at which the quantum phase transition to an FFLO state occurs at the mean-field level is strongly suppressed in imbalanced Fermi gases. This strongly shrinks the phase space region where the FFLO state is unstable and more exotic ground state is to be found. In the presence of high level impurities, this shrinkage may destroy the FFLO state completely.

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Universal Phase Diagram and Scaling Functions of Imbalanced Fermi Gases

Cited by 38 publications

References 58 publications

Superfluid-normal quantum phase transitions in an imbalanced Fermi gas

Superfluid-normal quantum phase transitions in an imbalanced Fermi gas

Experimental conditions for the observation of electron-hole superfluidity in GaAs heterostructures

The Gor'kov and Melik‐Barkhudarov Correction to the Mean‐Field Critical Field Transition to Fulde–Ferrell–Larkin–Ovchinnikov States

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