发表机构
Loughborough University（拉夫堡大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过封装和压力调控扭曲双层石墨烯，发现非径向自旋纹理下的纯共线爱德斯坦效应，并利用压力调节费米面与量子几何，为莫尔异质结构的拓扑和自旋-电荷转换提供新途径。
AI 中文摘要
层状原子薄材料之间通过范德华力介导的耦合允许强电子关联、独特的拓扑特征和非平凡的自旋纹理，所有这些在自旋、谷和轨道电子器件的创建中起着重要作用。在这里，我们证明了被过渡金属二硫化物封装的扭曲双层石墨烯表现出普遍的非径向自旋纹理，尽管缺乏这种径向对称性，却拥有纯共线的爱德斯坦效应。此外，我们展示了如何使用单轴压力进一步调节能带结构并改变活性费米面的数量，而不损害共线响应。最后，我们说明了量子几何如何在封装的扭曲石墨烯双层中变化，随着更大的压力将贝里曲率扩展到莫尔布里渊区的大区域。这些结果说明了封装和压力如何被用来显著改变莫尔异质结构的拓扑和自旋-电荷转换过程。
英文摘要
The coupling between layered atomically-thin materials mediated by van der Waals forces allows strong electronic correlations, unique topological signatures, and non-trivial spin textures, all of which play an important role in the creation of spin-, valley-, and orbitronic devices. Here, we demonstrate that twisted bilayer graphene encapsulated by transition metal dichalcogenides exhibits a generically non-radial spin texture yet hosts a purely collinear Edelstein effect despite this lack of radial symmetry. Moreover, we show how uniaxial pressure can be used to further tune the band structure and change the number of active Fermi surfaces without compromising the collinear response. Lastly, we illustrate how the quantum geometry changes in the encapsulated twisted graphene bilayer with larger pressures spreading the Berry curvature over large regions of the moiré Brillouin zone. These results illustrate how encapsulation and pressure can be used to drastically alter the topology and spin-charge interconversion processes of moiré heterostructures.
Comments11 pages, 5 figures
