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.

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

References in corpus (3)

• Surprises on the Way from 1D to 2D Quantum Magnets: the Novel Ladder Materials
• Interplay among critical temperature, hole content, and pressure in the cuprate superconductors
• A Hybrid Method for Global Updates in Monte Carlo Study

Cited by in corpus (2)

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