论文标题
在扭曲时操纵石墨烯/过渡金属二甲藻元化杂化生中的自旋传输
Manipulation of Spin Transport in Graphene/Transition Metal Dichalcogenide Heterobilayers upon Twisting
论文作者
论文摘要
接近效应是外来现象的支柱之一，也是二维材料的技术应用。但是，相互作用性质在很大程度上取决于所涉及的材料，它们的结晶对称性和界面特性。在这里，我们使用大规模的第一原则计算来证明应变和扭曲角度是有效的旋钮，可以定制石墨烯过渡金属二甲藻元化元素异源杂质体中的自旋轨道耦合。我们发现，通过选择30度的扭曲角度，自旋松弛时间增加了两个数量级，从而为改善这些异质结构的旋转传输能力开放了一条路径。此外，我们证明应变和扭曲角将修改山谷和Rashba自旋轨道耦合的相对值，从而使系统将系统调整为理想的狄拉克拉什巴式策略。这些结果使我们能够设想一个在不同实验中发现的自旋轨道耦合的变异性的答案，并对依赖于多晶的应用产生重大后果，在不同的方向上形成谷物。
Proximity effects are one of the pillars of exotic phenomena and technological applications of two dimensional materials. However, the interactions nature depends strongly on the materials involved, their crystalline symmetries, and interfacial properties. Here we used large-scale first-principle calculations to demonstrate that strain and twist-angle are efficient knobs to tailor the spin-orbit coupling in graphene transition metal dichalcogenide heterobilayers. We found that by choosing a twist-angle of 30 degrees, the spin relaxation times increase by two orders of magnitude, opening a path to improve these heterostructures spin transport capability. Moreover, we demonstrate that strain and twist angle will modify the relative values of valley-Zeeman and Rashba spin-orbit coupling, allowing to tune the system into an ideal Dirac-Rashba regime. These results enable us to envision an answer for the variability of spin-orbit coupling found in different experiments and have significant consequences for applications that depend on polycrystallinity, where grains form at different orientations.
