Charge-order transition in the extended Hubbard model on a two-leg ladder
Abstract
We investigate the charge-order transition at zero temperature in a two-leg Hubbard ladder with additional nearest-neighbor Coulomb repulsion V using the Density Matrix Renormalization Group technique. We consider electron densities between quarter and half filling. For quarter filling and U=8t, we find evidence for a continuous phase transition between a homogeneous state at small V and a broken-symmetry state with "checkerboard" [wavevector Q=(pi,pi)] charge order at large V. This transition to a checkerboard charge-ordered state remains present at all larger fillings, but becomes discontinuous at sufficiently large filling. We discuss the influence of U/t on the transition and estimate the position of the tricritical points.
Keywords
Cite
@article{arxiv.cond-mat/9906101,
title = {Charge-order transition in the extended Hubbard model on a two-leg ladder},
author = {Matthias Vojta and R. E. Hetzel and R. M. Noack},
journal= {arXiv preprint arXiv:cond-mat/9906101},
year = {2016}
}
Comments
4 pages, 5 figs, minor changes, accepted for publication in PRB RC