Pairing without Superfluidity: The Ground State of an Imbalanced Fermi Mixture

Abstract

Radio-frequency spectroscopy is used to study pairing in the normal and superfluid phases of a strongly interacting Fermi gas with imbalanced spin populations. At high spin imbalances the system does not become superfluid even at zero temperature. In this normal phase full pairing of the minority atoms is observed. This demonstrates that mismatched Fermi surfaces do not prevent pairing but can quench the superfluid state, thus realizing a system of fermion pairs that do not condense even at the lowest temperature.

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• Imbalanced Feshbach-resonant Fermi gases
• Determination of the Superfluid Gap in Atomic Fermi Gases by Quasiparticle Spectroscopy
• Spectral Functions and rf Response of Ultracold Fermionic Atoms
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• The FFLO state in the one-dimensional attractive Hubbard model and its fingerprint in the spatial noise correlations
• The Finite Temperature Pairing Gap of a Unitary Fermi Gas by Quantum Monte Carlo Calculations
• Spectral response and contact of the unitary Fermi gas
• Coherence and clock shifts in ultracold Fermi gases with resonant interactions
• Theory of quasi-one dimensional imbalanced Fermi gases
• Polarons and Molecules in a Two-Dimensional Fermi Gas
• Superfluidity and phase transitions in a resonant Bose gas
• Pairing in fermionic systems: A quantum information perspective
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• Determination of the Equation of State of a Two-Component Fermi Gas at Unitarity
• Finite temperature phase diagram of a spin-polarized ultracold Fermi gas in a highly elongated harmonic trap
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• Zero-temperature equation of state of mass-imbalanced resonant Fermi gases
• Density and spin response function of a normal Fermi gas at unitarity
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• A strongly interacting Bose gas: Nozières and Schmitt-Rink theory and beyond
• Imaginary polarization as a way to surmount the sign problem in ab initio calculations of spin-imbalanced Fermi gases
• Pairing instabilities in quasi-two-dimensional Fermi gases
• Strain induced superconductor-insulator transition on Lieb lattice
• Pi-phases in balanced fermionic superfluids on spin-dependent optical lattices
• Pairing and the spin susceptibility of the polarized unitary Fermi gas in the normal phase
• Pairing Reentrance Phenomenon in Heated Rotating Nuclei in the Shell Model Monte Carlo Approach
• Dynamic response of strongly correlated Fermi gases in the quantum virial expansion
• Resonant enhancement of the FFLO-state in 3D by a one-dimensional optical potential
• Bogoliubov-de Gennes study of trapped spin-imbalanced unitary Fermi gases
• Critical behaviour in one dimension: unconventional pairing, phase separation, BEC-BCS crossover and magnetic Lifshitz transition
• Finite-Temperature Behavior of an Inter-species Fermionic Superfluid with Population Imbalance
• Finite-size and confinement effects in spin-polarized trapped Fermi gases
• Population imbalanced lattice fermions near the BCS-BEC crossover: I.The breached pair and metastable FFLO phases
• Population imbalanced lattice fermions near the BCS-BEC crossover: II. The FFLO regime and its thermal signatures
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• Polarized superfluids near their tricritical point
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• Fulde-Ferrell-Larkin-Ovchinnikov state in bilayer dipolar systems
• Dynamic structure factor of a strongly correlated Fermi superfluid within a density functional theory approach
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• Influence of Induced Interactions on Superfluid Properties of Quasi-Two Dimensional Dilute Fermi Gases With Spin-Orbit Coupling
• Phase transitions in quasi-one dimensional system with unconventional superconductivity
• Generic features of the spectrum of trapped polarized fermions
• Phase diagram of imbalanced fermions in optical lattices
• Coordinate-Space Hartree-Fock-Bogoliubov Description of Superfluid Fermi Systems
• BCS-BEC Crossover in Mix-dimensional Fermi Gases
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• Spontaneous appearance of nonzero momentum Cooper pairing: Possible application to the iron-pnictides
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• Resonant scattering effect in spectroscopies of interacting atomic gases
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• Superfluidity in atomic Fermi gases
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