论文标题
磁封装的扭曲的范德华二分元中的交换偏置控制的相关性
Exchange-bias controlled correlations in magnetically encapsulated twisted van der Waals dichalcogenides
论文作者
论文摘要
扭曲的范德华材料已成为实现异国物质相关状态的范式平台。在这里，我们表明，在磁性范德华材料（Crbr $ _3 $）之间包裹的扭曲的二分法双层（WSE $ _2 $）具有带有可调谷和旋转口味的平坦带。我们证明，当包括电子 - 电子相互作用时，源自相关性之间的相互作用，固有的自旋 - 轨道耦合和交换接近效应的相互作用，自旋 - 铁磁性和山谷 - 铁磁性状态出现。我们表明，特定的对称性破裂状态是由封装磁化的相对对准控制的，这证明了由交换偏差控制的相关状态的出现。我们的结果提出了一个新的范德华异质结构，其中对称破碎的状态从扭曲工程，旋转轨道耦合和交换接近之间的真正相互作用中浮现出来，从而为探索物质的外来集体状态提供了强大的起点。
Twisted van der Waals materials have become a paradigmatic platform to realize exotic correlated states of matter. Here, we show that a twisted dichalcogenide bilayer (WSe$_2$) encapsulated between a magnetic van der Waals material (CrBr$_3$) features flat bands with tunable valley and spin flavors. We demonstrate that, when electron-electron interactions are included, spin-ferromagnetic and valley-ferromagnetic states emerge in the flat bands, stemming from the interplay between correlations, intrinsic spin-orbit coupling and exchange proximity effects. We show that the specific symmetry broken state is controlled by the relative alignment of the magnetization of the encapsulation, demonstrating the emergence of correlated states controlled by exchange bias. Our results put forward a new van der Waals heterostructure where symmetry broken states emerge from a genuine interplay between twist engineering, spin-orbit coupling and exchange proximity, providing a powerful starting point to explore exotic collective states of matter.
