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arXiv 2011.06714cond-mat.mes-hall
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石墨烯/过渡金属双硫族化合物异质双层膜中自旋输运的扭转调控

Manipulation of Spin Transport in Graphene/Transition Metal Dichalcogenide Heterobilayers upon Twisting

Armando Pezo, Zeila Zanolli, Nils Wittemeier, Pablo Ordejon, Adalberto Fazzio, Stephan Roche, Jose H. Garcia

摘要:

邻近效应是二维材料奇异现象和技术应用的支柱之一。然而,相互作用的性质强烈地依赖于所涉及的材料、它们的晶体对称性和界面性质。在这里,我们使用大规模的第一性原理计算来证明应变和扭转角是有效的旋钮,以定制石墨烯过渡金属二硫属化物异质双层中的自旋-轨道耦合。我们发现,通过选择30度的扭转角,自旋弛豫时间增加了两个数量级,打开了一条路径,以提高这些异质结构的自旋输运能力。此外,我们证明,应变和扭转角将修改valley-Zeeman和Rashba自旋轨道耦合的相对值,允许调整到一个理想的Dirac-Rashba制度的系统。这些结果使我们能够设想在不同的实验中发现的自旋-轨道耦合的可变性的答案,并具有显着的后果依赖于多晶性,其中晶粒形成在不同的取向的应用程序。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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