One-Electron Spectral Functions of the Attractive Hubbard Model for Intermediate Coupling

Abstract

We calculate the one-electron spectral function of the attractive (negative-$U$) Hubbard model. We work in the intermediate coupling and low density regime and obtain the self-energy in an approximate analytical form. The excitation spectrum is found to consist of three branches. The results are obtained in a framework, based on the self-consistent T-matrix approximation, which is compatible with the Mermin-Wagner theorem.

7 pages, revtex, 7 figures in postscript format, submitted to PRB

References in corpus (1)

• Superconducting properties of the attractive Hubbard model

Cited by in corpus (20)

• Normal state of highly polarized Fermi gases: simple many-body approaches
• Phase Fluctuations and Pseudogap Phenomena
• Theory of Superconductivity in Strongly Correlated Electron Systems
• Pairing fluctuations and pseudogaps in the attractive Hubbard model
• Self-consistent theory for molecular instabilities in a normal degenerate Fermi gas in the BEC-BCS crossover
• Superfluid nuclear matter calculations
• Bound states of three and four resonantly interacting particles
• Two-particle pairing and phase separation in a two-dimensional Bose-gas with one or two sorts of bosons
• Fermi-Bose mixtures and BCS-BEC crossover in high-Tc superconductors
• Fermi-to-Bose crossover in a trapped quasi-2D gas of fermionic atoms
• Role of bound pairs in the optical properties of highly excited semiconductors: a self consistent ladder approximation approach
• Unconventional superconductivity in low density electron systems and conventional superconductivity in hydrogen metallic alloys under pressure
• Phase Fluctuations and Single Fermion Spectral Density in 2D Systems with Attraction
• A self-consistent, conserving theory of the attractive Hubbard model in two dimensions
• Droplets of the order parameter in a low density attracting electron system in the presence of a strong random potential
• Manifestation of the Upper Hubbard band in the 2D Hubbard model at low electron density
• Excitation spectrum of the two-dimensional attractive Hubbard model
• Dynamical BCS theory of a two-dimensional attractive Fermi gas: effective interactions from Quantum Monte Carlo calculations
• Demonstration of a robust pseudogap in a three-dimensional correlated electronic system
• Pseudogap and photoemission spectra in the attractive Hubbard model