Temperature and final state effects in radio frequency spectroscopy experiments on atomic Fermi gases

Abstract

We present a systematic characterization of the radio frequency (RF) spectra of homogeneous, paired atomic Fermi gases at finite temperatures, $T$, in the presence of final state interactions. The spectra, consisting of possible bound states and positive as well as negative detuning ($\nu$) continua, satisfy exactly the zeroth- and first-moment sum rules at all $T$. We show how to detect the $\nu <0$ continuum arising from thermally excited quasiparticles, which has not yet been seen experimentally. We explain semi-quantitatively recent RF experiments on "bound-bound" transitions and, thereby, predict the associated effects of varying temperature.

4 pages, 4 figures

References in corpus (14)

• Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
• Thermodynamics of the BCS-BEC crossover
• Pairing without Superfluidity: The Ground State of an Imbalanced Fermi Mixture
• Universal thermodynamics of strongly interacting Fermi gases
• BCS-BEC crossover at finite temperature in the broken-symmetry phase
• Determination of the Fermion Pair Size in a Resonantly Interacting Superfluid
• 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
• Superfluid density and condensate fraction in the BCS-BEC crossover regime at finite temperatures
• Twin peaks in rf spectra of Fermi gases at unitarity
• Competition between final-state and pairing-gap effects in the radio-frequency spectra of ultracold Fermi atoms
• Final-state effects in the radio frequency spectrum of strongly interacting fermions
• Radio Frequency Spectroscopy of Trapped Fermi Gases with Population Imbalance

Cited by in corpus (17)

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• Imbalanced Feshbach-resonant Fermi gases
• Repulsive polarons and itinerant ferromagnetism in strongly polarized Fermi gases
• Probing the Spectral Function Using Momentum Resolved Radio Frequency Spectroscopy in Trapped Fermi Gases
• Enhanced paraconductivity-like fluctuations in the radio frequency spectra of ultracold Fermi atoms
• Pseudogaps in strongly interacting Fermi gases
• Comparative Study of BCS-BEC Crossover Theories above $T_c$: the Nature of the Pseudogap in Ultra-Cold Atomic Fermi Gases
• Theory of Radio Frequency Spectroscopy Experiments in Ultracold Fermi Gases and Their Relation to Photoemission Experiments in the Cuprates
• Pseudogap phenomena in ultracold atomic Fermi gases
• Pairing-gap, pseudo-gap, and no-gap phases in the radio-frequency spectra of a trapped unitary 6Li gas
• Clock shifts in a Fermi gas interacting with a minority component: a soluble model
• Resonant scattering effect in spectroscopies of interacting atomic gases
• Superfluidity in atomic Fermi gases
• Second-order response theory of radio-frequency spectroscopy for cold atoms
• Radio Frequency Response of the Strongly Interacting Fermi Gases at Finite Temperatures
• Radio frequency spectrum of fermions near a narrow Feshbach resonance
• Probing the homogeneous spectral function of a strongly interacting superfluid atomic Fermi gas in a trap using phase separation and momentum resolved rf spectroscopy