Dual role of the stripe phase in superconducting correlations in a bilayer square lattice

Ting Guo; Lufeng Zhang; Tianxing Ma; Hai-Qing Lin

doi:10.1103/PhysRevB.111.195127

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Dual role of the stripe phase in superconducting correlations in a bilayer square lattice

Ting Guo, Lufeng Zhang, Tianxing Ma, Hai-Qing Lin

DOI 10.1103/PhysRevB.111.195127 · Physical Review B

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Abstract

While the stripe phase has been observed not only in monolayer cuprates but also in bilayer cuprates, research on its behavior in bilayer cuprates has been limited. Using constrained path quantum Monte Carlo, we explore the effect of stripes on the bilayer square lattice. We find the system exhibits short-range antiferromagnetism, which is enhanced by stripes and is strongest when the electron density of the interstriped rows reaches half-filling. The hole doping concentration plays a crucial role in the interaction between stripes and superconductivity. The d-wave pairing is enhanced by stripe potential V0 at the hole doping δh=1/4, whereas it is suppressed by stripe potential V0 at the hole doping δh=1/8. We elucidate this phenomenon through an analysis of the magnetism of the interstriped rows. Furthermore, the effective d-wave pairing is stronger in the bilayer model compared to the monolayer model when stripes are introduced on the square lattice. Overall, our unbiased numerical simulations provide a further understanding of the crossed bilayer square lattice model.