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Plaquette bond order wave in the quarter-filled extended Hubbard model on the checkerboard lattice

Abstract : An extended Hubbard model (including nearest-neighbor repulsion and antiferromagnetic spin exchange) is investigated on the frustrated checkerboard lattice, a two-dimensional analog of the pyrochlore lattice. Combining Gutzwiller renormalized mean-field (MF) calculations, exact diagonalization (ED) techniques, and a weak-coupling renormalization group (RG) analysis we provide strong evidence for a crystalline valence bond plaquette phase at quarter-filling. The ground state is twofold degenerate and breaks translation symmetry. The bond energies show a staggering while the charge distribution remains uniform.
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https://hal.archives-ouvertes.fr/hal-00131594
Contributor : Didier Poilblanc Connect in order to contact the contributor
Submitted on : Friday, February 16, 2007 - 11:07:04 PM
Last modification on : Wednesday, October 20, 2021 - 3:47:06 AM

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Martin Indergand, Carsten Honerkamp, Andreas Laeuchli, Didier Poilblanc, Manfred Sigrist. Plaquette bond order wave in the quarter-filled extended Hubbard model on the checkerboard lattice. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2007, 75 (4), pp.045105. ⟨10.1103/PhysRevB.75.045105⟩. ⟨hal-00131594⟩

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