Partenaires

CNRS
UPS



Rechercher

Sur ce site

Sur le Web du CNRS


Accueil du site > Publications > Publications 2007 > Checkerboard order in the t—J model on the square lattice

Checkerboard order in the t—J model on the square lattice

D. Poilblanc, C. Weber, F. Mila & M. Sigrist

par Didier Poilblanc - 23 mai 2006

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.

http://arxiv.org/PS_cache/cond-mat/pdf/0605/0605226.pdf