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arXiv 2102.12015cond-mat.str-el
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双层高温铜氧化物超导体中的自旋织构

Spin texture in a bilayer high-temperature cuprate superconductor

Xiancong Lu, David Sénéchal

摘要:

利用集团动力学平均场论(CDMFT)研究了双层铜氧化物超导体$\rm Bi_2Sr_2CaCu_2O_{8+δ}$中自旋织构的可能性。采用单带哈伯德模型描述该材料,模型中存在层间小的跳跃和Rashba自旋轨道耦合。的$d$ -波序参量的Rashba耦合的存在下,没有太大的影响,但一个小的三重态分量出现。我们发现在$\mathbf{k}=(0,0)$和$\mathbf{k}=(π,π)$周围有一个同向循环的自旋织构,并且相对于超导相是稳定的。然而,自旋结构的振幅受到赝能隙现象的强烈影响,比谱函数本身更甚。

英文摘要:

We investigate the possibility of spin texture in the bilayer cuprate superconductor $\rm Bi_2Sr_2CaCu_2O_{8+δ}$ using cluster dynamical mean field theory (CDMFT). 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 $\mathbf{k}=(π,π)$ and stable against the superconducting phase. The amplitude of the spin structure, however, is strongly affected by the pseudogap phenomenon, more so than the spectral function itself.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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