Dynamic response of strongly correlated Fermi gases in the quantum virial expansion

Abstract

By developing a quantum virial expansion theory, we quantitatively calculate the dynamic density response function of a trapped strongly interacting Fermi gas at high temperatures near unitarity. A clear transition from atomic to molecular responses is identified in the spectra when crossing from the BCS to BEC regimes, in qualitative agreement with recent Bragg spectroscopy observations. Our virial expansion method provides a promising way to solve the challenging strong-coupling problems and is applicable to other dynamical properties of strongly correlated Fermi gases.

5 pages, 4 figures; published version in Phys. Rev. A. The quantum virial expansion of single-particle spectral function is discussed in arXiv:1003.1538 (Phys. Rev. Lett. 104, 240407 (2010))

References in corpus (6)

• Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
• Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
• Using photoemission spectroscopy to probe a strongly interacting Fermi gas
• Bragg spectroscopy of a strongly interacting Fermi gas
• Virial expansion for a strongly correlated Fermi gas
• Pairing without Superfluidity: The Ground State of an Imbalanced Fermi Mixture

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• Virial expansion for a strongly correlated Fermi gas with imbalanced spin populations
• High temperature thermodynamics of strongly interacting s-wave and p-wave Fermi gases in a harmonic trap
• Dynamic structure factor of a strongly correlated Fermi superfluid within a density functional theory approach
• Many-body theories of density response for a strongly correlated Fermi gas
• Neutrino-Neutron Scattering Opacities in Supernova Matter