48 citations · 343 across the 48 of their papers we have counts for
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The breakdown of the mean-field description of the Nagaoka phase
Evgueny Kochetov, Fabio L. Braghin, Alvaro Ferraz
We discuss the relevance of the improved mean-field slave-fermion theory to describe the Nagaoka () limit of the Hubbard model. In this theory the crucial on-site constra…
Low-energy effective representation of the Gutzwiller-projected BCS Hamiltonian close to half filling
Evgueny Kochetov, Alvaro Ferraz, Rafael T. Pepino
We investigate analytically a connection between the t-J model and the strongly correlated Bardeen-Cooper-Schrieffer (BCS) Hamiltonian, with the effect of strong electron correlati…
Breakdown of the Fermi-liquid regime in the 2D Hubbard model from a two-loop field-theoretical renormalization group approach
Hermann Freire, Eberth Correa, Alvaro Ferraz
We analyze the particle-hole symmetric two-dimensional Hubbard model on a square lattice starting from weak-to-moderate couplings by means of the field-theoretical renormalization…
Doped carrier formulation of the t-J model: the projection constraint and the effective Kondo-Heisenberg lattice representation
Rafael T. Pepino, Alvaro Ferraz, Evgueny Kochetov
We show that the recently proposed doped carrier Hamiltonian formulation of the t-J model should be complemented with the constraint that projects out the unphysical states. With t…