Beyond linear response spectroscopy of ultracold Fermi gases

Abstract

We study RF-spectroscopy of ultracold Fermi gas by going beyond the linear response in the field-matter interaction. Higher order perturbation theory allows virtual processes and energy conservation beyond the single particle level. We formulate an effective higher order theory which agrees quantitatively with experiments on the pairing gap, and is consistent with the absence of the mean-field shift in the spin-flip experiment.

arXiv comment4 pages, 3 figures. Text revised, new figures

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Cited by in corpus (6)

• Strongly interacting Fermi gases with density imbalance
• Imbalanced Superfluid Phase of a Trapped Fermi Gas in the BCS-BEC Crossover Regime
• Quantum dynamical response of ultracold few boson ensembles in finite optical lattices to multiple interaction quenches
• Bosonic quantum dynamics following a linear interaction quench in finite optical lattices of unit filling
• 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