Quantum Melting of Charge Order due to Frustration in Two-Dimensional Quarter-Filled Systems

Abstract

The effect of geometrical frustration in a two-dimensional 1/4-filled strongly correlated electron system is studied theoretically, motivated by layered organic molecular crystals. An extended Hubbard model on the square lattice is considered, with competing nearest neighbor Coulomb interaction, V, and that of next-nearest neighbor along one of the diagonals, V', which favor different charge ordered states. Based on exact diagonalization calculations, we find a metallic phase stabilized over a broad window at V' ~ V even for large Coulomb repulsion strengths as a result of frustrating the charge ordered states. Slightly modifying the lattice geometry relevant to the actual organic compounds does not alter the results, suggesting that this `quantum melting' of charge order is a robust feature of frustrated strongly correlated 1/4-filled systems.

arXiv comment5 pages, 4 figures, to be published in Phys. Rev. B

References in corpus (16)

• Charge-ordering, commensurability and metallicity in the phase diagram of layered Na(x)CoO(2)
• Charge Ordering in Organic ET Compounds
• Superconductivity mediated by charge fluctuations in layered molecular crystals
• Supersolids in the Bose-Hubbard Hamiltonian
• Phase diagram of the one-dimensional extended Hubbard model at quarter filling
• Phase diagram of the one-dimensional extended Hubbard model with attractive and/or repulsive interactions at quarter filling
• Charge ordering and antiferromagnetic exchange in layered molecular crystals of the theta type
• Large dielectric constant and giant nonlinear conduction in the organic conductor theta-(BEDT-TTF)_2CsZn(SCN)_4
• Superconductivity in Na_xCoO_2yH_2O by charge fluctuation
• Competition between Charge Ordering and Superconductivity in Layered Organic Conductors $\alpha$-(BEDT-TTF)${}_{2}M$Hg(SCN)${}_4$ (M = K, NH${}_4$)
• Phase diagram of the quarter-filled extended Hubbard model on a two-leg ladder
• Dynamical properties of a strongly correlated model for quarter-filled layered organic molecular crystals
• Metal-insulator transition and charge ordering in the extended Hubbard model at one-quarter filling
• Charge fluctuation induced superconducting state in two-dimensional quarter-filled electron systems
• Optical response in one dimensional Mott Insulators
• Anomalous behaviors of the charge and spin degrees of freedom in the CuO double chains of PrBa${}_2$Cu${}_4$O${}_8$

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