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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2007

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

Martin Indergand
  • Fonction : Auteur
Carsten Honerkamp
  • Fonction : Auteur
Andreas Laeuchli
  • Fonction : Auteur
Manfred Sigrist
  • Fonction : Auteur

Résumé

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.

Dates et versions

hal-00131594 , version 1 (16-02-2007)

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Citer

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), 2007, 75 (4), pp.045105. ⟨10.1103/PhysRevB.75.045105⟩. ⟨hal-00131594⟩
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