Dynamical Cluster Quantum Monte Carlo Study of the Single Particle Spectra of Strongly Interacting Fermion Gases

Abstract

We study the single-particle spectral function of resonantly-interacting fermions in the unitary regime, as described by the three-dimensional attractive Hubbard model in the dilute limit. Our approach, based on the Dynamical Cluster Approximation and the Maximum Entropy Method, shows the emergence of a gap with decreasing temperature, as reported in recent cold-atom photoemission experiments, for coupling values that span the BEC-BCS crossover. By comparing the behavior of the spectral function to that of the imaginary time dynamical pairing susceptibility, we attribute the development of the gap to the formation of local bound atom pairs.

4 pages, 4 figures, accepted by PRA Rapid Communication.

References in corpus (13)

• Theory of ultracold Fermi gases
• Color superconductivity in dense quark matter
• Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
• Using photoemission spectroscopy to probe a strongly interacting Fermi gas
• Resonantly-paired fermionic superfluids
• Thermodynamics of the BCS-BEC crossover
• Critical Temperature and Thermodynamics of Attractive Fermions at Unitarity
• Strongly paired fermions: Cold atoms and neutron matter
• Single-particle properties and pseudogap effects in the BCS-BEC crossover regime of an ultracold Fermi gas above Tc
• BCS-BEC crossover at finite temperature in the broken-symmetry phase
• Determination of the Fermion Pair Size in a Resonantly Interacting Superfluid
• Large-N expansion for unitary superfluid Fermi gases
• Radio frequency spectroscopy of a strongly imbalanced Feshbach-resonant Fermi gas

Cited by in corpus (26)

• BEC-BCS crossover and universal relations in unitary Fermi gases
• Pseudogaps in strongly interacting Fermi gases
• Superfluid density of states and pseudogap phenomenon in the BCS-BEC crossover regime of a superfluid Fermi gas
• Spin susceptibility and fluctuation corrections in the BCS-BEC crossover regime of an ultracold Fermi gas
• Low temperature properties of the infinite-dimensional attractive Hubbard model
• Evolution of the Pseudogap in a polarized Fermi gas
• Dispersions, weights, and widths of the single-particle spectral function in the normal phase of a Fermi gas
• Pseudogap temperature and effects of a harmonic trap in the BCS-BEC crossover regime of an ultracold Fermi gas
• Uniform spin susceptibility and spin-gap phenomenon in the BCS-BEC crossover regime of an ultracold Fermi gas
• Coexistence of strong nematic and superconducting correlations in a two-dimensional Hubbard model
• The pseudogap regime in the unitary Fermi gas
• Universal dynamic structure factor of a strongly correlated Fermi gas
• Mesoscopic spin transport between strongly interacting Fermi gases
• Strong-coupling corrections to spin susceptibility in the BCS-BEC crossover regime of a superfluid Fermi gas
• Hidden fermionic excitation in the superconductivity of the strongly attractive Hubbard model
• Pair condensation in a Finite Trapped Fermi Gas
• Precursor of Superfluidity in a Strongly Interacting Fermi Gas with Negative Effective Range
• The Operator Product Expansion Beyond Leading Order for Two-Component Fermions
• Quasiparticle Dispersions and Lifetimes in the Normal State of the BCS-BEC Crossover
• Spin susceptibility and effects of a harmonic trap in the BCS-BEC crossover regime of an ultracold Fermi gas
• Low-Dimensional Fluctuations and Pseudogap in Gaudin-Yang Fermi Gases
• Spectroscopic Bogoliubov features near the unitary limit
• A Universal Energy Functional for Trapped Fermi Gases with Large Scattering Length
• Pseudogap regime of a two-dimensional uniform Fermi gas
• Probing the homogeneous spectral function of a strongly interacting superfluid atomic Fermi gas in a trap using phase separation and momentum resolved rf spectroscopy
• Spin Susceptibility and Strong Coupling Effects in an Ultracold Fermi Gas