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.

arXiv comment4 pages, 5 figures

References in corpus (9)

• Charge Ordering in Organic ET Compounds
• Superconductivity mediated by charge fluctuations in layered molecular crystals
• Charge ordering and antiferromagnetic exchange in layered molecular crystals of the theta type
• Quantum Melting of Charge Order due to Frustration in Two-Dimensional Quarter-Filled Systems
• Mean-field study of charge order with long periodicity in $\theta$-(BEDT-TTF)${}_2$X
• Study of the triangular lattice tV model near x=1/3
• Charge fluctuation induced superconducting state in two-dimensional quarter-filled electron 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

Cited by in corpus (34)

• Electrodynamics of Correlated Electron Materials
• Strong coupling theory of the spinless charges on the triangular lattices: possibility of a new quantum liquid
• Crystallization and vitrification of electrons in a glass-forming charge liquid
• Bandwidth tuning triggers interplay of charge order and superconductivity in two-dimensional organic materials
• The Origin of the Charge Ordering and Its Relevance to Superconductivity in $\theta$-(BEDT-TTF)${}_2$X: The Effect of the Fermi Surface Nesting and the Distant Electron-Electron Interactions
• Growth Dynamics of Photoinduced Domains in Two-Dimensional Charge-Ordered Conductors Depending on Stabilization Mechanisms
• Charge Order with Structural Distortion in Organic Conductors: Comparison between θ-(ET)2RbZn(SCN)4 and α-(ET)2I3
• Phase Diagram of Spinless Fermions on an Anisotropic Triangular Lattice at Half-filling
• Charge ordering and coexistence of charge fluctuations in quasi-two-dimensional organic conductors $\theta$-(BEDT-TTF)${}_{2}X$
• Phase diagram of the triangular extended Hubbard model
• Coexistence of distinct charge fluctuations in $\theta$-(BEDT-TTF)${}_2$X
• Charge, Lattice, and Spin Dynamics in Photoinduced Phase Transitions from Charge-Order-Insulator to Metal in Quasi-Two-Dimensional Organic Conductors
• Quantum critical behavior of electrons at the edge of charge order
• Phase Competition and Superconductivity in $\kappa$-(BEDT-TTF)${}_2$X: Importance of Intermolecular Coulomb Interactions
• Charge and spin order on the triangular lattice -- Na${}_x$CoO${}_2$ at $x=0.5$
• Effects of Electron-Lattice Coupling on Charge Order in θ-(ET)2X
• ^{59}Co NMR evidence for charge ordering below T_{CO}\sim 51 K in Na_{0.5}CoO_2
• Geometrical frustration effects on charge-driven quantum phase transitions
• Correlation Effects on Charge Order and Zero-Gap State in the Organic Conductor α-(BEDT-TTF)2I3
• Charge Fluctuations in Geometrically Frustrated Charge Ordering System
• Theoretical Aspects of Charge Correlations in $\theta$-(BEDT-TTF)${}_{2}X$
• Enhancement of Spin Susceptibility near Charge-Ordering Transition in a Two-Dimensional Extended Hubbard Model
• Variational Monte Carlo Study of a Spinless Fermion t-V Model on a Triangular Lattice: Formation of a Pinball Liquid
• Long-Period Charge Correlations in Charge-Frustrated Molecular theta-(BEDT-TTF)2X
• Coulomb Frustrated Phase Separation in Quasi-Two-Dimensional Organic Conductors on the Verge of Charge Ordering
• Competing Generalized Wigner Crystal States in Moiré Heterostructures
• Collective excitation of a short-range charge ordering in $\theta$-$\mbox{(BEDT-TTF)}_2\mbox{CsZn(SCN)}_4$
• Anomalous 2D-confined electronic transport in layered organic charge-glass systems
• Density-matrix renormalization study of the frustrated fermions on the triangular lattice
• Superconductivity in the Three-Fold Charge-Ordered Metal of the Triangular-Lattice Extended Hubbard Model
• Thermal algebraic-decay charge liquid driven by competing short-range Coulomb repulsion
• Finite Temperature Properties of Geometrically Charge Frustrated Systems
• Fermi Surface Deformation near Charge-Ordering Transition
• Density Matrix Renormalization Group study of superconducting pairing near the quarter-filled Wigner crystal