Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-07-12
Phys. Rev. B 71, 125111 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 4 figures, to be published in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.71.125111
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.
Merino Jaime
Ogata Masao
Seo Hitoshi
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