Twin peaks in rf spectra of Fermi gases at unitarity

Abstract

We calculate the radio-frequency spectrum of balanced and imbalanced ultracold Fermi gases in the normal phase at unitarity. For the homogeneous case the spectrum of both the majority and minority components always has a single peak even in the pseudogap regime. We furthermore show how the double-peak structures observed in recent experiments arise due to the inhomogeneity of the trapped gas. The main experimental features observed above the critical temperature in the recent experiment of Schunck et al. [Science 316, 867, (2007)] are recovered with no fitting parameters.

v3: version accepted for publication as a Rapid Communication in PRA. With respect to v2, minor changes in the text and in the inset of Fig. 2

References in corpus (9)

• Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
• Normal state of a polarized Fermi gas at unitarity
• Pairing without Superfluidity: The Ground State of an Imbalanced Fermi Mixture
• Tomographic RF Spectroscopy of a Trapped Fermi Gas at Unitarity
• Theory of RF-spectroscopy of strongly interacting Fermions
• Coherence and clock shifts in ultracold Fermi gases with resonant interactions
• Competition between final-state and pairing-gap effects in the radio-frequency spectra of ultracold Fermi atoms
• Bragg Spectroscopy of Cold Atomic Fermi Gases
• Radio Frequency Spectroscopy of Trapped Fermi Gases with Population Imbalance

Cited by in corpus (44)

• Polarons, Dressed Molecules, and Itinerant Ferromagnetism in ultracold Fermi gases
• Observation of pseudogap behavior in a strongly interacting Fermi gas
• Repulsive Fermi polarons in a resonant mixture of ultracold ${}^6$Li atoms
• Field-theoretical study of the Bose polaron
• Ultra-cold Polarized Fermi Gases
• Determination of the Superfluid Gap in Atomic Fermi Gases by Quasiparticle Spectroscopy
• Fermi polarons in two dimensions
• 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
• Pseudo-gap pairing in ultracold Fermi atoms
• Quasiparticle properties of an impurity in a Fermi gas
• Collisional Properties of a Polarized Fermi Gas with Resonant Interactions
• Pseudogaps in strongly interacting Fermi gases
• Attractive Fermi polarons at nonzero temperature with finite impurityconcentration
• Polarons in a Dipolar Condensate
• 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
• The role of interactions in spin-polarised atomic Fermi gases at unitarity
• Comparison of Different Pairing Fluctuation Approaches to BCS-BEC Crossover
• Spin polarons and molecules in strongly-interacting atomic Fermi gases
• Thermal crossover, transition, and coexistence in Fermi polaronic spectroscopies
• Pseudogap phenomena in ultracold atomic Fermi gases
• Final-state effects in the radio frequency spectrum of strongly interacting fermions
• Dynamical Cluster Quantum Monte Carlo Study of the Single Particle Spectra of Strongly Interacting Fermion Gases
• Crossover polarons in a strongly interacting Fermi superfluid
• Breakdown of the Fermi polaron description near Fermi degeneracy at unitarity
• Temperature and final state effects in radio frequency spectroscopy experiments on atomic Fermi gases
• Pairing-gap, pseudo-gap, and no-gap phases in the radio-frequency spectra of a trapped unitary 6Li gas
• Pairing and radio-frequency spectroscopy in two-dimensional Fermi gases
• Momentum-resolved spectroscopy of a Fermi liquid
• Coexistence of superfluid gap and pseudogap in the BCS-BEC crossover regime of a trapped Fermi gas below $T_{\mathrm{c}}$
• Intersections of ultracold atomic polarons and nuclear clusters: How is a chart of nuclides modified in dilute neutron matter?
• Detection of Fermi Pairing via Electromagnetically Induced Transparency
• Dynamic structure factor of a strongly correlated Fermi superfluid within a density functional theory approach
• 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
• Resonant scattering effect in spectroscopies of interacting atomic gases
• Radio Frequency Response of the Strongly Interacting Fermi Gases at Finite Temperatures
• Peaks and widths of radio-frequency spectra: An analysis of the phase diagram of ultra-cold Fermi gases
• Repulsive Fermi and Bose Polarons in Quantum Gases
• Probing the homogeneous spectral function of a strongly interacting superfluid atomic Fermi gas in a trap using phase separation and momentum resolved rf spectroscopy