Critical Dimerization Strength of the Quarter-Filled t-J Model
Abstract
An exact-diagonalization technique on small clusters is used to study the ground state of the dimerized t-J model at quarter filling. The equal-time charge and spin correlations, charge and spin gaps, and binding energy are calculated for the two-dimensional lattice with a spatial dimerization pattern corresponding to organic conductors . We show that competition between the effects of two types of dimerization, i.e., dimerization in the hopping integral and dimerization in the exchange interaction, leads to the insulator-superconductor transition in the ground state of the model. The phase diagram is thereby presented.
Keywords
Cite
@article{arxiv.cond-mat/9805346,
title = {Critical Dimerization Strength of the Quarter-Filled t-J Model},
author = {S. Nishimoto and Y. Ohta},
journal= {arXiv preprint arXiv:cond-mat/9805346},
year = {2009}
}
Comments
4 pages with 4 gif figures. Hardcopies of figures (or the entire manuscript) can be obtained by e-mail request to [email protected]