U-J Synergy Effect for the High Tc Superconductors

Abstract

Using renormalization group and exact diagonalization of small clusters we investigate the ground state phase diagram of a two-dimensional extended Hubbard model with nearest-neighbor exchange interaction J, in addition to the local Coulomb repulsion U. The main instabilities are antiferromagnetism close to half-filling and d-wave superconductivity in the doped system. Our results suggest that the combined action of J and U interactions provide a remarkably efficient mechanism to enhance both d-wave superconducting and antiferromagnetic correlations.

arXiv commentFinal version, to appear in PRB

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• Competing Pairing Symmetries in a Generalized Two-Orbital Model for the Pnictides
• Generation of d-wave coupling in the two-dimensional Hubbard model from functional renormalization
• Breakdown of the Fermi-liquid regime in the 2D Hubbard model from a two-loop field-theoretical renormalization group approach
• Signatures of pairing in the magnetic excitation spectrum of strongly correlated ladders
• Hubbard Model with Inter-Site Kinetic Correlations
• Phase diagram of the t-U-J1-J2 chain at half filling
• From d- to p-wave pairing in the t-t' Hubbard model at zero temperature