Novel Charge Order and Superconductivity in Two-Dimensional Frustrated Lattice at Quarter Filling

Abstract

Motivated by the various physical properties observed in $\theta$-(BEDT-TTF)${}_2$X, we study the ground state of extended Hubbard model on two-dimensional anisotropic triangular lattice at 1/4-filling with variational Monte Carlo method. It is shown that the nearest-neighbor Coulomb interaction enhances the charge fluctuation and it induces the anomalous state such as charge-ordered metallic state and the triplet next-nearest-neighbor $f$-wave superconductivity. We discuss the relation to the real materials and propose the unified view of the family of $\theta$-(BEDT-TTF)${}_2$X.

4 pages, 5 figures

References in corpus (3)

• Quantum Melting of Charge Order due to Frustration in Two-Dimensional Quarter-Filled Systems
• Charge order and superconductivity in a two-dimensional triangular lattice at n=2/3
• Charge Ordered Insulator without Magnetic Order Studied by Correlator Projection Method

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