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.

arXiv comment5 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 (11)

• Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
• Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
• Exploring the Thermodynamics of a Universal Fermi Gas
• Using photoemission spectroscopy to probe a strongly interacting Fermi gas
• Excitation of phonons in a Bose-Einstein condensate by light scattering
• 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
• High temperature expansion applied to fermions near Feshbach resonance
• Molecular signatures in the structure factor of an interacting Fermi gas
• Dynamic structure factor of a superfluid Fermi gas

Cited by in corpus (16)

• Few-body physics with ultracold atomic and molecular systems in traps
• Virial expansion for a strongly correlated Fermi system and its application to ultracold atomic Fermi gases
• Three attractively interacting fermions in a harmonic trap: Exact solution, ferromagnetism, and high-temperature thermodynamics
• Temperature dependence of the contact in a unitary Fermi gas
• Exact few-body results for strongly correlated quantum gases in two dimensions
• Universal contact of strongly interacting fermions at finite temperatures
• Static structure factor of a strongly correlated Fermi gas at large momenta
• 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
• Universal dynamic structure factor of a strongly correlated Fermi gas
• Dynamic structure factor of a strongly correlated Fermi superfluid within a density functional theory approach
• Establishing the Gauge Invariant Linear Response of Fermionic Superfluids with Pair Fluctuations: A Diagrammatic approach
• Response function of strongly interacting Fermi gas in a virial expansion
• Density and Spin Linear Response of Atomic Fermi Superfluids with Population Imbalance in BCS-BEC Crossover
• Many-body theories of density response for a strongly correlated Fermi gas
• Neutrino-Neutron Scattering Opacities in Supernova Matter