Stripes and superconducting pairing in the t−J model with Coulomb interactions

E. Arrigoni; A. P. Harju; W. Hanke; B. Brendel; S. A. Kivelson

doi:10.1103/PhysRevB.65.134503

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Stripes and superconducting pairing in the t−J model with Coulomb interactions

E. Arrigoni, A. P. Harju, W. Hanke, B. Brendel, S. A. Kivelson

DOI 10.1103/PhysRevB.65.134503 · Physical Review B

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Abstract

We study the competition between long- and short-range interactions among charge carriers in strongly-correlated electronic systems employing a method which combines the density-matrix renormalization-group technique with a self-consistent treatment of the long-range interactions. We apply the method to an extended t−J model which exhibits “stripe” order. The Coulomb interactions, while not destroying stripes, induce large transverse stripe fluctuations with associated charge delocalization. This leads to a substantial Coulomb-repulsion-induced enhancement of long-range superconducting pair-field correlations.