Enhanced pairing in doped quantum magnets with frustrating hole motion

Abstract

Evidence for strong pairing at arbitrary small J/t is provided in a t-J model on the checkerboard lattice for the sign of hopping leading to frustration in hole motion. Destructive quantum interferences suppress Nagaoka ferromagnetism when J->0 and reduce drastically coherent hole motion in the fluctuating singlet background. It is shown that, by pairing in various orbital symmetry channels, holes can benefit from a large gain of kinetic energy.

arXiv comment4 pages, 6 figures Important changes in manuscript & figures

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• Mott Transition in the Hubbard Model on Checkerboard Lattice
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• Supersolid phases of a doped valence-bond quantum antiferromagnet: Evidence for a coexisting superconducting order parameter
• Mixed Columnar-Plaquette Crystal of correlated fermions on the 2D pyrochlore lattice at fractional filling
• Exotic Mott phases of the extended t--J model on the checkerboard lattice at commensurate densities
• A resonant valence bond spin liquid in the dilute limit of doped frustrated Mott insulators
• Competition between $d$-wave and $d$+$is$-wave superconductivity in the Hubbard model on a checkerboard lattice
• Exotic phenomena in doped quantum magnets
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