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Functional renormalization group approach to the Anderson impurity model
Lorenz Bartosch, Hermann Freire, Jose Juan Ramos Cardenas +1
We develop a functional renormalization group approach which describes the low-energy single-particle properties of the Anderson impurity model up to intermediate on-site interacti…
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…
Renormalization group calculation of the uniform susceptibilities in low-dimensional systems
Hermann Freire, Eberth Correa, Alvaro Ferraz
We analyze the one-dimensional (1D) and the two-dimensional (2D) repulsive Hubbard models (HM) for densities slightly away from half-filling through the behavior of two central qua…
Insulating spin liquid in the lightly doped two-dimensional Hubbard model
Hermann Freire, Eberth Correa, Alvaro Ferraz
We calculate the charge compressibility and uniform spin susceptibility for the two-dimensional (2D) Hubbard model slightly away from half-filling within a two-loop renormalization…
Field-theoretical renormalization group for a flat two-dimensional Fermi surface
H. Freire, E. Correa, A. Ferraz
We implement an explicit two-loop calculation of the coupling functions and the self-energy of interacting fermions with a two-dimensional flat Fermi surface in the framework of th…
"Luttinger" and insulating spin liquids in two dimensions
H. Freire, E. Correa, A. Ferraz
In the present work, we implement an explicit two-loop renormalization of a two-dimensional flat Fermi surface (FS) in the framework of a field theoretical renormalization group ap…