Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-09-06
Phys. Rev. B 75, 045105 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 6 figures, published version
Scientific paper
10.1103/PhysRevB.75.045105
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.
Honerkamp Carsten
Indergand Martin
Laeuchli Andreas
Poilblanc Didier
Sigrist Manfred
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