二维晶体原子间耦合的角分辨光电子能谱测定
Determination of interatomic coupling between two-dimensional crystals using angle-resolved photoemission spectroscopy
摘要：
在二维晶体如石墨烯或单层过渡金属二硫属化物之间缺乏定向键合提供了用于垂直范德华异质结构的组分的选择的不寻常的自由度。然而，即使对于相同的层，它们的堆叠，特别是它们的结晶方向之间的相对角度，也会改变结构的性质。我们证明了两个二维晶体之间的原子间耦合可以从具有一个取向和一个扭曲界面的三层结构的角分辨光电子能谱来确定。每个接口提供互补信息，并且它们一起使得能够自一致地确定耦合。我们通过研究扭曲的三层石墨烯来参数化碳原子的原子间耦合，并表明结果可以应用于具有不同扭曲和层数的结构。我们的方法演示了如何提取层间耦合的基本信息在一堆二维晶体，并可以应用到许多其他的范德华界面。
英文摘要：
Lack of directional bonding between two-dimensional crystals like graphene or monolayer transition metal dichalcogenides provides unusual freedom in selection of components for vertical van der Waals heterostructures. However, even for identical layers, their stacking, in particular the relative angle between their crystallographic directions, modifies properties of the structure. We demonstrate that the interatomic coupling between two two-dimensional crystals can be determined from angle-resolved photoemission spectra of a trilayer structure with one aligned and one twisted interface. Each of the interfaces provides complementary information and together they enable self-consistent determination of the coupling. We parametrize interatomic coupling for carbon atoms by studying twisted trilayer graphene and show that the result can be applied to structures with different twists and number of layers. Our approach demonstrates how to extract fundamental information about interlayer coupling in a stack of two-dimensional crystals and can be applied to many other van der Waals interfaces.
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