Frustration effects in an anisotropic checkerboard lattice Hubbard model

Takuya Yoshioka, Akihisa Koga, Norio Kawakami

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

We study the ground-state properties of the geometrically frustrated Hubbard model on the anisotropic checkerboard lattice with nearest-neighbor hopping t and next-nearest-neighbor hopping t′. By using the path-integral renormalization-group method, we study the phase diagram in the parameter space of the Hubbard interaction U and the frustration-control parameter t′ /t. Close examinations of the effective hopping, the double occupancy, the momentum distribution, and the spin- and charge-correlation functions allow us to determine the phase diagram at zero temperature, at which the plaquette-singlet insulator emerges besides the antiferromagnetic insulator and the paramagnetic metal. Spin-liquid insulating states without any kind of symmetry breaking cannot be found in our frustrated model.

Original languageEnglish
Article number165113
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number16
DOIs
Publication statusPublished - 2008 Oct 14
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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