相互作用二维晶体的宏观自取向
Macroscopic self-reorientation of interacting two-dimensional crystals
摘要：
微机电系统可以纳米精度移动或旋转，已经在射频电子学、微衰减器、传感器等领域得到应用。特别有趣的是那些允许精细控制原子尺度上的运动，由于自对准机制和原子水平上的作用力。这种机器可以产生良好控制的运动，作为对外部参数微小变化的反应。在这里，我们证明，对于六方氮化硼上的石墨烯系统，范德华力和弹性能之间的相互作用导致石墨烯机械地朝向六方氮化硼晶体学方向自转。这种旋转是宏观的（对于几十微米的石墨烯薄片，切向运动可以是几百纳米），并且可以用于对准的范德华异质结构的可再现制造。
英文摘要：
Microelectromechanical systems, which can be moved or rotated with nanometre precision, already find applications in such fields like radio-frequency electronics, micro-attenuators, sensors and many others. Especially interesting are those which allow fine control over the motion on atomic scale due to self-alignment mechanisms and forces acting on the atomic level. Such machines can produce well-controlled movements as a reaction to small changes of the external parameters. Here we demonstrate that, for the system of graphene on hexagonal boron nitride, the interplay between the van der Waals and elastic energies results in graphene mechanically self-rotating towards the hexagonal boron nitride crystallographic directions. Such rotation is macroscopic (for graphene flakes of tens of micrometres the tangential movement can be on hundreds of nanometres) and can be used for reproducible manufacturing of aligned van der Waals heterostructures.
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