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

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• Ultra-cold Polarized Fermi Gases
• Determination of the Superfluid Gap in Atomic Fermi Gases by Quasiparticle Spectroscopy
• Spectral Functions and rf Response of Ultracold Fermionic Atoms
• Universal Properties of the Ultra-Cold Fermi Gas
• Determination of the Fermion Pair Size in a Resonantly Interacting Superfluid
• Repulsive polarons and itinerant ferromagnetism in strongly polarized Fermi gases
• The Finite Temperature Pairing Gap of a Unitary Fermi Gas by Quantum Monte Carlo Calculations
• Probing the Spectral Function Using Momentum Resolved Radio Frequency Spectroscopy in Trapped Fermi Gases
• Universal Short-Distance Structure of the Single-Particle Spectral Function of Dilute Fermi Gases
• 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
• 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
• Theory of Radio Frequency Spectroscopy Experiments in Ultracold Fermi Gases and Their Relation to Photoemission Experiments in the Cuprates
• Physics of ultracold Fermi gases revealed by spectroscopies
• Spin polarons and molecules in strongly-interacting atomic Fermi gases
• Pseudogap phenomena in ultracold atomic Fermi gases
• Final-state effects in the radio frequency spectrum of strongly interacting fermions
• Radiofrequency spectroscopy of ${}^6$Li p-wave molecules: towards photoemission spectroscopy of a p-wave superfluid
• Breakdown of the Fermi polaron description near Fermi degeneracy at unitarity
• Strain induced superconductor-insulator transition on Lieb lattice
• Temperature and final state effects in radio frequency spectroscopy experiments on atomic Fermi gases
• Pairing and radio-frequency spectroscopy in two-dimensional Fermi gases
• Pairing-gap, pseudo-gap, and no-gap phases in the radio-frequency spectra of a trapped unitary 6Li gas
• Detection of Fermi Pairing via Electromagnetically Induced Transparency
• 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
• Resonant scattering effect in spectroscopies of interacting atomic gases
• Clock shifts in a Fermi gas interacting with a minority component: a soluble model
• Peaks and widths of radio-frequency spectra: An analysis of the phase diagram of ultra-cold Fermi gases
• Second-order response theory of radio-frequency spectroscopy for cold atoms
• Probing the homogeneous spectral function of a strongly interacting superfluid atomic Fermi gas in a trap using phase separation and momentum resolved rf spectroscopy
• Radio-frequency driving of an attractive Fermi gas in a one-dimensional optical lattice