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Equation of Motion Solutions to Hubbard Model retaining Kondo Effect | | Grzegorz Gorski
; Jerzy Mizia
; | | Date: |
26 Nov 2012 | | 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 rhe DMFT scheme.
The EOM method is combined together with Edwards-Hertz interpolating
approximation and the second order perturbation theory (SOPT). Such EOM
approach describes well not only the strong-coupling but also the weak-coupling
results, 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. | | Source: | arXiv, 1211.6038 | | Services: | Forum | Review | PDF | Favorites | |
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