t−J model for a bilayer: Coexisting superconductivity and planar-flux phases
Hongbo Zhao, Jan R. Engelbrecht
DOI 10.1103/PhysRevB.71.054508 · Physical Review B
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Abstract
We study the bilayer generalization of the t−J model with both hopping and exchange coupling between the two layers. Within the enlarged mean-field parameter space, we find dimerized, s+id, flux ladder and planar flux phases. Of particular interest is the planar flux phase that persists farther away from half-filling, and coexists with, and even stabilizes, dx2−y2-superconductivity. The orbital currents in the phase generate staggered moments that are rotated away from the c-axis.
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