Finite-temperature investigation of quarter filled ladder systems
Strongly Correlated Electrons
2007-05-23 v1
Abstract
We investigate charge ordering in a quarter-filled ladder at finite temperature by determinantal Quantum Monte Carlo. The sign problem is moderate in a wide range of model parameters relevant for NaV2O5. The charge order parameter exhibits a crossover as a function of inverse temperature on finite systems. Above a critical nearest neighbor Coulomb repulsion, the correlation length grows exponentially with inverse temperature, indicative of the ordered phase at T=0. We find a clear single-particle gap manifesting itself in a flat n(\mu) dependence at large nearest neighbor Coulomb repulsion.
Cite
@article{arxiv.cond-mat/0406715,
title = {Finite-temperature investigation of quarter filled ladder systems},
author = {C. Gabriel and E. Sherman and T. C. Lang and M. Aichhorn and H. G. Evertz},
journal= {arXiv preprint arXiv:cond-mat/0406715},
year = {2007}
}
Comments
2 pages, 4 eps-figures, submitted to SCES04