论文标题
双曲线等离子和超导的相互作用
Interplay of hyperbolic plasmons and superconductivity
论文作者
论文摘要
双曲线等离子是分层导体中的集体电子激发。它们与许多超导材料有关，包括铜层和分层双曲线材料[V. N. Smolyanininova等。科学报告6，34140（2016）]。这项工作研究双曲线等离子的异常分散如何影响配对配对。我们使用Migdal-EliAshberg方程，使用Grabowski-Sham近似值在数值和分析上都可以求解，并具有一致的结果。我们找不到在合理的参数范围内等离子体介导的配对的证据。然而，结果表明，双曲线等离子可以显着降低库珀通道中库仑排斥的影响，从而增强源自其他配对机制的过渡温度。在由相同层组成的双曲线材料的模型中，我们发现这种增强功能是$ d $ - 波频道中最强的。我们还讨论了设计最佳双曲线等离子体背景的策略，以进一步增强$ s $ - 波和$ d $ - 波频道的超导性。
Hyperbolic plasmons are collective electron excitations in layered conductors. They are of relevance to a number of superconducting materials, including the cuprates and layered hyperbolic metamaterials [V. N. Smolyaninova, et al. Scientific Reports 6, 34140 (2016)]. This work studies how the unusual dispersion of hyperbolic plasmons affects Cooped pairing. We use the Migdal-Eliashberg equations, which are solved both numerically and analytically using the Grabowski-Sham approximation, with consistent results. We do not find evidence for plasmon-mediated pairing within a reasonable parameter range. However, it is shown that the hyperbolic plasmons can significantly reduce the effects of Coulomb repulsion in the Cooper channel leading to an enhancement of the transition temperature originating from other pairing mechanisms. In the model of a hyperbolic material composed of identical layers, we find this enhancement to be the strongest in the $d$-wave channel. We also discuss strategies for engineering an optimal hyperbolic plasmon background for a further enhancement of superconductivity in both $s$-wave and $d$-wave channels.
