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Mechanism of high-temperature superconductivity in a striped Hubbard model

E. Arrigoni, E. Fradkin, S. A. Kivelson

DOI 10.1103/PhysRevB.69.214519 · Physical Review B

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Abstract

It is shown, using asymptotically exact methods, that the two-dimensional repulsive Hubbard model with strongly modulated interactions exhibits “high-temperature superconductivity.” Specifically, the explicit modulation, which has the same symmetry as period 4 bond-centered stripes, breaks the system into an alternating array of more and less heavily hole-doped, nearly decoupled two-leg ladders. It is shown that this system exhibits a pairing scale determined by the spin gap of the undoped two-leg ladder, and a phase ordering temperature proportional to a low positive power of the interladder coupling.

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