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

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dc.creatorMerino, Jaime
dc.creatorSeo, Hitoshi
dc.creatorOgata, Masao
dc.date2004-07-12
dc.date2004-12-13
dc.date.accessioned2026-07-07T02:59:09Z
dc.date.available2026-07-07T02:59:09Z
dc.descriptionThe 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.
dc.description5 pages, 4 figures, to be published in Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/cond-mat/0407280
dc.identifierhttp://arxiv.org/abs/cond-mat/0407280
dc.identifierPhys. Rev. B 71, 125111 (2005)
dc.identifierdoi:10.1103/PhysRevB.71.125111
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/24398
dc.subjectStrongly Correlated Electrons
dc.titleQuantum Melting of Charge Order due to Frustration in Two-Dimensional Quarter-Filled Systems
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