Superconductivity from correlated hopping
C. D. Batista, F. Lema, A. A. Aligia
Abstract
We consider a chain described by a next-nearest-neighbor hopping combined with a nearest-neighbor spin flip. In two dimensions this three-body term arises from a mapping of the three-band Hubbard model for CuO2 planes to a generalized t-J model and for large O-O hopping favors resonance-valence-bond superconductivity of predominantly d-wave symmetry. Solving the ground state and low-energy excitations by analytical and numerical methods we find that the chain is a Luther-Emery liquid with correlation exponent Kρ = (2-n)2/2, where n is the particle density.
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