Radio Frequency Spectroscopy of Trapped Fermi Gases with Population Imbalance

Abstract

Motivated by recent experiments, we address, in a fully self consistent fashion, the behavior and evolution of radio frequency (RF) spectra as temperature and polarization are varied in population imbalanced Fermi gases. We discuss a series of scenarios for the experimentally observed zero temperature pseudogap phase and show how present and future RF experiments may help in its elucidation. We conclude that the MIT experiments at the lowest $T$ may well reflect ground state properties, but take issue with their claim that the pairing gap survives up to temperatures of the order of the degeneracy temperature $T_F$ at unitarity.

4 page, 3 figures, submitted to PRA Rapid

References in corpus (14)

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• Observation of Phase Separation in a Strongly-Interacting Imbalanced Fermi Gas
• Normal state of highly polarized Fermi gases: simple many-body approaches
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• Normal state of a polarized Fermi gas at unitarity
• Finite temperature phase diagram of a polarised Fermi condensate
• Pairing without Superfluidity: The Ground State of an Imbalanced Fermi Mixture
• Strongly interacting Fermi gases with density imbalance
• Generic Phase Diagram of Fermion Superfluids with Population Imbalance
• Superfluid phase diagrams of trapped Fermi gases with population imbalance
• Thermodynamics and superfluid density in BCS-BEC crossover with and without population imbalance
• Single-plane-wave Larkin-Ovchinnikov-Fulde-Ferrell state in BCS--Bose-Einstein condensation crossover
• Imbalanced Superfluid Phase of a Trapped Fermi Gas in the BCS-BEC Crossover Regime
• Superfuid-insulator transitions at non-integer filling in optical lattices of fermionic atoms

Cited by in corpus (16)

• Verification of universal relations in a strongly interacting Fermi gas
• Pseudogaps in strongly interacting Fermi gases
• Twin peaks in rf spectra of Fermi gases at unitarity
• Radio frequency spectroscopy of a strongly imbalanced Feshbach-resonant Fermi gas
• Single Impurity In Ultracold Fermi Superfluids
• Theory of Radio Frequency Spectroscopy Experiments in Ultracold Fermi Gases and Their Relation to Photoemission Experiments in the Cuprates
• Final-state effects in the radio frequency spectrum of strongly interacting fermions
• Strong coupling s-wave superconductors in the extreme Pauli limit: I.The breached pair and metastable FFLO phases
• 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
• Temperature and final state effects in radio frequency spectroscopy experiments on atomic Fermi gases
• Conserving T-matrix theory of superconductivity
• Detection of Fermi Pairing via Electromagnetically Induced Transparency
• Tunneling properties of a bound pair of Fermi atoms in an optical lattice
• Generic features of the spectrum of trapped polarized fermions
• Anomalous pseudogap in population imbalanced Fermi superfluids