论文标题
轨道依赖性的自能力效应和对多轨相关电子系统超导间隙结构的后果
Orbital-dependent self-energy effects and consequences for the superconducting gap structure in multi-orbital correlated electron systems
论文作者
论文摘要
我们对电子相关性对多波段超导体超导间隙结构的影响进行理论研究。特别是，通过将基于标准的RPA基于RPA的自旋介导的间隙结构与基于铁的超导体的Flex形式主义中获得的间隙结构进行比较，我们可以直接从电子空间间隙结构上获得电子电子相互作用的反馈效应。我们展示了自我能量效应如何导致轨道分辨自旋敏感性的轨道反转，从而将最重要的轨道轨道通道的层次结构颠倒。这种效果对费米表面的详细差距变化具有重要的后果。我们期望对配对差距的这种自我能量反馈通常与密切相关的多轨系统中的超导性有关。
We perform a theoretical study of the effects of electronic correlations on the superconducting gap structure of multi-band superconductors. In particular, by comparing standard RPA-based spin-fluctuation mediated gap structures to those obtained within the FLEX formalism for an iron-based superconductor, we obtain directly the feedback effects from electron-electron interactions on the momentum-space gap structure. We show how self-energy effects can lead to an orbital inversion of the orbital-resolved spin susceptibility, and thereby invert the hierarchy of the most important orbitals channels for superconducting pairing. This effect has important consequences for the detailed gap variations on the Fermi surface. We expect such self-energy feedback on the pairing gap to be generally relevant for superconductivity in strongly correlated multi-orbital systems.
