Checkerboard order in the t--J model on the square lattice
Strongly Correlated Electrons
2009-11-11 v1
Abstract
We propose that the inhomogeneous patterns seen by STM in some underdoped superconducting cuprates could be related to a bond-order-wave instability of the staggered flux state, one of the most studied "normal" state proposed to compete with the d-wave RVB superconductor. A checkerboard pattern is obtained by a Gutzwiller renormalized mean-field theory of the t-J model for doping around 1/8. It is found that the charge modulation is always an order of magnitude smaller than the bond-order modulations. This is confirmed by an exact optimization of the wavefunction by a variational Monte Carlo scheme. The numerical estimates of the order parameters are however found to be strongly reduced w.r.t their mean-field values.
Keywords
Cite
@article{arxiv.cond-mat/0605226,
title = {Checkerboard order in the t--J model on the square lattice},
author = {D. Poilblanc and C. Weber and F. Mila and M. Sigrist},
journal= {arXiv preprint arXiv:cond-mat/0605226},
year = {2009}
}