AI 中文总结
该研究提出FeSe/铜酸盐异质结构可作为实现交替磁性的平台，通过两种机制诱导交替磁性并转移至铜酸盐层，为研究其与非常规超导耦合提供了新方向。
AI 中文摘要
在高Tc铜酸盐基体系中实现交替磁性，将为研究无净磁化下的自旋劈裂电子带及其与非常规超导的相互作用提供直接途径。本文提出FeSe/铜酸盐异质结构可作为此类平台：Cu与Fe层呈45°扭转形成有效CuFe₂ Lieb晶格，其中Fe磁有序与配体介导的Cu-Fe杂化诱导交替磁性d波自旋劈裂，最小紧束缚模型表明该机制具有普适性。此外，衬底诱导FeSe中两个Se位点不等价，提供了第二种机制：交替磁性源于Fe层并通过邻近效应转移至铜酸盐层。对FeSe/Bi₂Sr₂CuO₆异质结构的密度泛函理论计算证实两种机制均可行，并揭示了增强自旋劈裂的方法。这些结果确立了超导铜酸盐/过渡金属硫族化物异质结构是工程化交替磁性及研究其与非常规超导耦合的 promising 体系。
英文摘要
Realizing altermagnetism in high-$T_c$ cuprate-based systems would provide a direct route for studying spin-split electronic bands in the absence of net magnetization and investigate their interplay with unconventional superconductivity. Here, we propose that FeSe/cuprate heterostructures offer such a platform, where a 45$^\circ$ twist of Cu and Fe layers creates an effective CuFe$_2$ Lieb lattice in which Fe magnetic order and Cu-Fe hybridization through the ligands induces altermagnetic $d$-wave spin splitting. A minimal tight-binding model shows that this mechanism is generic. Furthermore, a substrate-induced inequivalence of the two Se sites in FeSe provides a second route in which altermagnetism originates in the Fe layer and is transferred to the cuprate layer by proximity. Density functional theory calculations for FeSe/Bi$_2$Sr$_2$CuO$_6$ heterostructures confirm the viability of both mechanisms and reveal ways to enhance the spin splitting. These results establish superconducting cuprate/transition metal chalcogenide heterostructures as a promising setting for engineering altermagnetism and studying its coupling to unconventional superconductivity.
