论文标题
基于石墨烯的范德华异质结构的平面瓦楞纸
Out-of-plane corrugations in graphene based van der Waals heterostructures
论文作者
论文摘要
二维材料通常被设想为扁平，真正的2D层。然而，这些材料中不可避免地会出现平面外的波纹。在此手稿中，我们表明石墨烯薄片封装在绝缘晶体（HBN，WSE2）之间，尽管具有较大的迁移率，但令人惊讶地包含了平面瓦楞纸。这些波纹的高度波动是在存在静态内部磁场的情况下使用弱定位测量结果揭示的。由于平面外的波纹，平面磁场会导致局部石墨烯平面的平面外部成分，从而导致相位相干性时间大大减少。原子力显微镜测量还证实了这些晶体中存在的远程高度调制。我们的结果表明，必须经过严格的护理进行相干运输实验，依靠范德华异质结构中的纯平面磁场。
Two dimensional materials are usually envisioned as flat, truly 2D layers. However out-of-plane corrugations are inevitably present in these materials. In this manuscript, we show that graphene flakes encapsulated between insulating crystals (hBN, WSe2), although having large mobilities, surprisingly contain out-of-plane corrugations. The height fluctuations of these corrugations are revealed using weak localization measurements in the presence of a static in-plane magnetic field. Due to the random out-of-plane corrugations, the in-plane magnetic field results in a random out-of-plane component to the local graphene plane, which leads to a substantial decrease of the phase coherence time. Atomic force microscope measurements also confirm a long range height modulation present in these crystals. Our results suggest that phase coherent transport experiments relying on purely in-plane magnetic fields in van der Waals heterostructures have to be taken with serious care.
