Quantum Monte Carlo Study of an Extended Hubbard Model on a Two-leg Ladder
Abstract
An extended Hubbard model on a two-leg ladder is numerically studied by means of the quantum Monte Carlo techniques. The model we study has the nearest-neighbor interactions which are repulsive along chains and attractive for rungs. The plots of the doping parameter versus the chemical potential show two cliff-like regions and a large plateau region. Results on the charge susceptibility suggest it diverges in these cliff-like regions. These observations might imply a signal to the phase separation, which should be related to the effective attractive interactions along chains.
Keywords
Cite
@article{arxiv.cond-mat/9705067,
title = {Quantum Monte Carlo Study of an Extended Hubbard Model on a Two-leg Ladder},
author = {Tomo Munehisa and Yasuko Munehisa},
journal= {arXiv preprint arXiv:cond-mat/9705067},
year = {2009}
}
Comments
12 pages, latex, 5 eps figures, to appear in J. Phys. Soc. Jpn. In order to make our discussions abundantly clear we added one figure and rewrote the section 4. A few references are also added