Critical Dimerization Strength of the Quarter-Filled t-J Model

Details Critical Dimerization Strength of the Quarter-Filled t-J Model Critical Dimerization Strength of the Quarter-Filled t-J Model

1998-05-27

arxiv.org/abs/cond-mat/9805346v1

J. Phys. Soc. Jpn. 67 (1998) 2598-2601

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages with 4 gif figures. Hardcopies of figures (or the entire manuscript) can be obtained by e-mail request to ohta@science

Scientific paper

10.1143/JPSJ.67.2598

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 $\kappa-(BEDT-TTF)_2X$. 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.

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