Theory of RF-spectroscopy of strongly interacting Fermions

Abstract

We show that strong pairing correlations in Fermi gases lead to the appearance of a gap-like structure in the RF-spectrum, both in the balanced superfluid and in the normal phase above the Clogston-Chandrasekhar limit. The average RF-shift of a unitary gas is proportional to the ratio of the Fermi velocity and the scattering length with the final state. In the strongly imbalanced case, the RF-spectrum measures the binding energy of a minority atom to the Fermi sea of majority atoms. Our results provide a qualitative understanding of recent experiments by Schunck et.al.

revised version, 4 pages, 3 figures, RevTex4

References in corpus (7)

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• Thermodynamics of the BCS-BEC crossover
• Normal state of a polarized Fermi gas at unitarity
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Cited by in corpus (52)

• Many-Body Physics with Ultracold Gases
• Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
• Using photoemission spectroscopy to probe a strongly interacting Fermi gas
• Verification of universal relations in a strongly interacting Fermi gas
• Ultra-cold Polarized Fermi Gases
• Determination of the Superfluid Gap in Atomic Fermi Gases by Quasiparticle Spectroscopy
• Number of closed-channel molecules in the BEC-BCS crossover
• Universal Properties of the Ultra-Cold Fermi Gas
• Excitation spectra and rf-response near the polaron-to-molecule transition from the functional renormalization group
• Universal Relations for Identical Bosons from 3-Body Physics
• Determination of the Fermion Pair Size in a Resonantly Interacting Superfluid
• Two and Three-body Contacts in the Unitary Bose Gas
• Spectral response and contact of the unitary Fermi gas
• Coherence and clock shifts in ultracold Fermi gases with resonant interactions
• Universal contact of strongly interacting fermions at finite temperatures
• Short-range correlations and entropy in ultracold atomic Fermi gases
• Competition between final-state and pairing-gap effects in the radio-frequency spectra of ultracold Fermi atoms
• Radio frequency spectroscopy of a strongly imbalanced Feshbach-resonant Fermi gas
• Static structure factor of a strongly correlated Fermi gas at large momenta
• Large-momentum distribution of a polarized Fermi gas and p-wave contacts
• Pseudogap phenomena in ultracold atomic Fermi gases
• Final-state effects in the radio frequency spectrum of strongly interacting fermions
• Fermi polarons at finite temperature: Spectral function and rf-spectroscopy
• Bose Gases Near Resonance: renormalized interactions in a condensate
• Tan contact and universal high momentum behavior of the fermion propagator in the BCS-BEC crossover
• Pairing and radio-frequency spectroscopy in two-dimensional Fermi gases
• Thermodynamic signatures of the polaron-molecule transition in a Fermi gas
• Induced P-wave superfluidity within full energy-momentum dependent Eliashberg approximation in asymmetric dilute Fermi gases
• Induced p-wave superfluidity in strongly interacting imbalanced Fermi gases
• Self-localization of a small number of Bose particles in a superfluid Fermi system
• Effect of fermion indistinguishability on optical absorption of doped two-dimensional semiconductors
• Polaron-like effects in a one-dimensional optical lattice
• Non-Fermi-Liquid Behavior from Cavity Electromagnetic Vacuum Fluctuations at the Superradiant Transition
• Maximum Energy Growth Rate in Dilute Quantum Gases
• Polaron spectra and edge singularities for correlated flat bands
• Generic features of the spectrum of trapped polarized fermions
• Photo-excitation measurement of Tan's contact for a strongly interacting Fermi gas
• Clock shifts in a Fermi gas interacting with a minority component: a soluble model
• Many-body theories of density response for a strongly correlated Fermi gas
• Quasiparticles, coherence and nonlinearity: exact simulations of RF-spectroscopy of strongly interacting one-dimensional Fermi gases
• Spectral properties and observables in ultracold Fermi gases
• Three-body contact for fermions. I. General relations
• Scattering resonances and pairing in a Rabi-coupled Fermi gas
• The Gor'kov and Melik-Barkhudarov correction to an imbalanced Fermi gas in the presence of impurities
• Repulsive Fermi and Bose Polarons in Quantum Gases
• Peaks and widths of radio-frequency spectra: An analysis of the phase diagram of ultra-cold Fermi gases
• Universal Relations for Fermions with Large Scattering Length
• Multiple polaron quasiparticles with dipolar fermions in a bilayer geometry
• Universal Bound States in Long-range Spin Chains with an Impurity
• Dimer-projection contact and the clock shift of a unitary Fermi gas
• Radio-frequency driving of an attractive Fermi gas in a one-dimensional optical lattice
• Universal Relations in Long-range Quantum Spin Chains