We investigate the possibility of spin texture in the bilayer cuprate superconductor ${\mathrm{Bi}}_2{\mathrm{Sr}}_2{\mathrm{CaCu}}_2{\mathrm{O}}_{8+\delta }$ using cluster dynamical mean-field theory. The one-band Hubbard model with a small interlayer hopping and a Rashba spin-orbit coupling is used to describe the material. The $d$-wave order parameter is not much affected by the presence of the Rashba coupling, but a small triplet component appears. We find a spin texture circulating in the same direction around $\mathbf{k}=(0,0)$ and $\mathbf{k}=(\pi ,\pi )$ and stable against the superconducting phase. We predict that the amplitude of the spin structure is strongly affected by the pseudogap phenomenon, more so than the spectral function itself.

中文翻译：

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双层高温铜酸盐超导体中的自旋织构

我们研究了双层铜酸盐超导体中自旋织构的可能性 ${双}_2{锶}_2{\mathrm{钙铜}}_2{\mathrm{哦}}_{8+\delta }$使用集群动态平均场理论。具有小层间跳跃和 Rashba 自旋轨道耦合的单波段哈伯德模型用于描述材料。这$d$-wave order 参数受 Rashba 耦合的影响不大，但出现了一个小的三重态分量。我们发现一个自旋纹理以相同的方向循环$\mathbf{克}=(0,0)$ 和 $\mathbf{克}=(\pi ,\pi )$并且对超导相稳定。我们预测自旋结构的幅度受赝隙现象的强烈影响，比谱函数本身更重要。