Insulating spin liquid in the lightly doped two-dimensional Hubbard model
Strongly Correlated Electrons
2009-11-11 v3 Superconductivity
Abstract
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 group scheme. We find numerically that both those quantities flow to zero as we increase the initial interaction strength from weak to intermediate couplings. This result implies gap openings in both charge and spin excitation spectra for the latter interaction regime. When this occurs, the ground state of the lightly doped 2D Hubbard model may be interpreted as an insulating spin liquid as opposed to a Mott insulating state.
Cite
@article{arxiv.cond-mat/0506682,
title = {Insulating spin liquid in the lightly doped two-dimensional Hubbard model},
author = {Hermann Freire and Eberth Correa and Alvaro Ferraz},
journal= {arXiv preprint arXiv:cond-mat/0506682},
year = {2009}
}
Comments
Accepted for publication in Phys. Rev. B