Dynamical cluster quantum Monte Carlo study of the single-particle spectra of strongly interacting fermion gases

Journal Article · Sat May 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.051604· OSTI ID:21408761

Shiquan, Su; Sheehy, Daniel E; Moreno, Juana; Jarrell, Mark ^[1]

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1. Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803 (United States)

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.

• OSTI ID: 21408761
• Journal Information: Physical Review. A, Vol. 81, Issue 5; Other Information: DOI: 10.1103/PhysRevA.81.051604; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
APPROXIMATIONS
ATOMS
COUPLING
ENTROPY
FERMIONS
HUBBARD MODEL
MONTE CARLO METHOD
PHOTOEMISSION
SPECTRA
SPECTRAL FUNCTIONS
THREE-DIMENSIONAL CALCULATIONS
CALCULATION METHODS
CRYSTAL MODELS
EMISSION
FUNCTIONS
MATHEMATICAL MODELS
PHYSICAL PROPERTIES
SECONDARY EMISSION
THERMODYNAMIC PROPERTIES