AI 中文总结
研究错配层状化合物中超导性的电子结构及伊辛保护，通过广泛DFT计算开发统一紧束缚模型，该模型能再现其能带结构，为超导伊辛保护提供微观机制，确立MLCs为独特三维材料。
AI 中文摘要
错配层状化合物（MLCs）为实现通常与二维过渡金属二卤化物（TMDs）相关的奇异量子态提供了一个独特的体平台，最显著的是伊辛保护的超导性。然而，缺乏一种超越电子隔离TMD层简单图像来描述其电子结构的理论。在此，我们为基于金属二卤化物的MLCs开发了一个统一的紧束缚模型，通过对多种结构构型和化学成分进行广泛的密度泛函理论（DFT）计算来参数化。我们表明，中间的四方层除了作为电荷库外还起着积极作用：它们介导了标准刚性带图像中完全不存在的显著层间自旋轨道耦合。这种新出现的层间自旋轨道耦合对于再现体MLCs的DFT能带结构至关重要，并且当纳入博戈留波夫 - 德热纳计算时，通过强烈增强面内临界场为超导性的伊辛保护提供了微观机制。我们的框架将MLCs确立为一类具有内在耦合层和新出现的自旋轨道现象的独特三维材料。
英文摘要
Misfit layered compounds (MLCs) offer a unique bulk platform for realizing exotic quantum states typically associated with two-dimensional transition-metal dichalcogenides (TMDs), most notably Ising-protected superconductivity. Yet a theoretical description capturing their electronic structure beyond the simplistic picture of electronically isolated TMD layers has been lacking. Here, we develop a unified tight-binding model for metal dichalcogenide-based MLCs, parameterized by extensive density-functional theory (DFT) calculations across multiple structural configurations and chemical compositions. We show that the intervening tetragonal layers play an active role beyond charge reservoirs: they mediate a significant interlayer spin-orbit coupling entirely absent in the standard rigid-band picture. This emergent interlayer spin-orbit coupling is essential for reproducing the DFT band structure of bulk MLCs and, when incorporated into Bogoliubov--de Gennes calculations, provides a microscopic mechanism for the Ising protection of superconductivity by strongly enhancing the in-plane critical field. Our framework establishes MLCs as a distinct class of three-dimensional materials with intrinsically coupled layers and emergent spin-orbit phenomena.
