Equation of Motion Solutions to Hubbard Model retaining Kondo Effect

Abstract

We propose a new way of analyzing the Hubbard model using equations of motion (EOM) for the higher-order Green's functions approach within the DMFT scheme. In calculating the higher order Green function we will differentiate over both Times (t) and (t'). This allows us to obtain the metallic Fermi liquid at nonzero Coulomb interaction, where the three center density of states (DOS) structure with two Hubbard bands and the quasiparticle resonance peak is obtained. At small Coulomb interactions and zero temperature the height of the quasiparticle resonance peak on the Fermi energy is constant similarly as in the full DMFT method with numerical (Quantum Monte Carlo) or with analytical (e.g. iterative perturbation theory) calculations.

10 pages, 4 figures

References in corpus (3)

• Decoupling method for dynamical mean field theory calculations
• A fast impurity solver based on equations of motion and decoupling
• Hubbard Model with Inter-Site Kinetic Correlations

Cited by in corpus (6)

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• Alternative equation of motion approach to the single-impurity Anderson model
• Electronic Dynamics of the Anderson Model. The Many-Body Approach