Competition between final-state and pairing-gap effects in the radio-frequency spectra of ultracold Fermi atoms

Abstract

The radio-frequency spectra of ultracold Fermi atoms are calculated by including final-state interactions affecting the excited level of the transition, and compared with the experimental data. A competition is revealed between pairing-gap effects which tend to push the oscillator strength toward high frequencies away from threshold, and final-state effects which tend instead to pull the oscillator strength toward threshold. As a result of this competition, the position of the peak of the spectra cannot be simply related to the value of the pairing gap, whose extraction thus requires support from theoretical calculations.

4 pages, 3 figures, final version published in Phys. Rev. Lett

References in corpus (7)

• Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
• Pairing without Superfluidity: The Ground State of an Imbalanced Fermi Mixture
• Tomographic RF Spectroscopy of a Trapped Fermi Gas at Unitarity
• BCS-BEC crossover at finite temperature in the broken-symmetry phase
• Theory of RF-spectroscopy of strongly interacting Fermions
• Radio-Frequency Transitions on Weakly-Bound Ultracold Molecules
• Coherence and clock shifts in ultracold Fermi gases with resonant interactions

Cited by in corpus (15)

• Theory of ultracold Fermi gases
• 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
• Universal Properties of the Ultra-Cold Fermi Gas
• Determination of the Fermion Pair Size in a Resonantly Interacting Superfluid
• Enhanced paraconductivity-like fluctuations in the radio frequency spectra of ultracold Fermi atoms
• Temperature and coupling dependence of the universal contact intensity for an ultracold Fermi gas
• Radio frequency spectroscopy of a strongly imbalanced Feshbach-resonant Fermi gas
• Final-state effects in the radio frequency spectrum of strongly interacting fermions
• Pairing-gap, pseudo-gap, and no-gap phases in the radio-frequency spectra of a trapped unitary 6Li gas
• Generic features of the spectrum of trapped polarized fermions
• Quasiparticles, coherence and nonlinearity: exact simulations of RF-spectroscopy of strongly interacting one-dimensional Fermi gases
• Clock shifts in a Fermi gas interacting with a minority component: a soluble model