衍射悖论：异常宽的衍射背景信号理想石墨烯
A diffraction paradox: An unusually broad diffraction background signals ideal graphene
摘要：
实现二维材料的不寻常的属性需要形成单层厚度的大域，在介观尺度上延伸。发现与教科书衍射相反，SiC上理想石墨烯的形成通过（00）和G（10）点周围的强钟形分量（BSC）而不是SiC（10）点来表示，BSC也见于金属上的石墨烯，因为也可以生长具有大横向尺寸的单层均匀石墨烯。它只能通过电子衍射观察到，而不能通过X射线或He散射实验观察到。最有可能的是，它起源于单层内石墨烯电子的空间限制。这导致它们的波矢量中的大的扩展，其通过电子-电子相互作用转移到弹性散射的电子以产生BSC。
英文摘要：
The realization of the unusual properties of 2-d materials requires the formation of large domains of single layer thickness, extending over the mesoscale. It is found that the formation of ideal graphene on SiC, contrary to textbook diffraction , is signaled by a strong bell-shaped-component (BSC) around the (00) and G(10), but not the SiC(10) spots.The BSC is also seen for graphene on metals, because single layer uniform graphene with large lateral size can also be grown. It is only seen by electron diffraction and not with X-ray or He-scattering experiments. Most likely it originates from the spatial confinement of the graphene electrons within a single layer. This leads to a large spread in their wavevector, which is transferred through electron-electron interactions to the elastically scattered electrons to generate the BSC.
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