Myriad phases of the Checkerboard Hubbard Model
Strongly Correlated Electrons
2009-11-13 v2
Abstract
The zero temperature phase diagram of the checkerboard Hubbard model is obtained in the solvable limit in which it consists of weakly coupled square plaquettes. As a function of the on-site Coulomb repulsion U and the density of holes per site, x, we demonstrate the existence of at least 16 distinct phases. For instance, at zero doping, the ground state is a novel d-wave Mott insulator (d-Mott), which is not adiabatically continuable to a band insulator; by doping the d-Mott state with holes, depending on the magnitude of U, it gives way to a d-wave superconducting state, a two-flavor spin-1/2 Fermi liquid (FL), or a spin-3/2 FL.
Keywords
Cite
@article{arxiv.0706.0761,
title = {Myriad phases of the Checkerboard Hubbard Model},
author = {Hong Yao and Wei-Feng Tsai and Steven A. Kivelson},
journal= {arXiv preprint arXiv:0706.0761},
year = {2009}
}
Comments
4 pages, 2 figures, minor revisions, published in Phys. Rev. B as a Rapid Communication