Systematic Analysis of Frustration Effects in Anisotropic Checkerboard Lattice Hubbard Model
arXiv:0808.1573 · doi:10.1103/PhysRevB.78.165113
Abstract
We study the ground state properties of the geometrically frustrated Hubbard model on the anisotropic checkerboard lattice with nearest-neighbor hopping and next nearest-neighbor hopping . By using the path-integral renormalization group method, we study the phase diagram in the parameter space of the Hubbard interaction and the frustration-control parameter . Close examinations of the effective hopping, the double occupancy, the momentum distribution and the spin/charge correlation functions allow us to determine the phase diagram at zero temperature, where 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.
arXiv comment7pages, 5figures
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