用hBN放大镜观察石墨烯中的应变诱导赝磁场
Visualizing Strain-induced Pseudo magnetic Fields in Graphene through an hBN Magnifying Glass
摘要：
石墨烯的显著特性是其二维蜂窝晶格结构所固有的。它的低维性，使得通过施加外力来重新排列原子成为可能，为机械控制电子特性提供了有趣的前景。在应变存在下，石墨烯产生伪磁场（PMF），其将能带结构重建为伪朗道能级（PLL）。然而，一个可行的路线，实现，表征和控制保偏光纤仍然缺乏。在这里，我们报告的方法来产生和表征PMFs的石墨烯膜上支持的纳米柱。通过在扫描隧道显微镜（STM）下对六方氮化硼（hBN）衬底形成的莫尔图案的放大效应来实现局部应变的直接测量。我们通过在扫描隧道光谱（STS）中观察到的PLL谱来量化应变引起的PMF。这项工作提供了一个途径，应变诱导工程和机电石墨烯为基础的设备。
英文摘要：
The remarkable properties of graphene are inherent to its 2D honeycomb lattice structure. Its low dimensionality, which makes it possible to rearrange the atoms by applying an external force, offers the intriguing prospect of mechanically controlling the electronic properties. In the presence of strain, graphene develops a pseudo-magnetic field (PMF) which reconstructs the band structure into pseudo Landau levels (PLLs). However, a feasible route to realizing, characterizing and controlling PMFs is still lacking. Here we report on a method to generate and characterize PMFs in a graphene membrane supported on nano-pillars. A direct measure of the local strain is achieved by using the magnifying effect of the Moiré pattern formed against a hexagonal Boron Nitride (hBN) substrate under scanning tunneling microscopy (STM). We quantify the strain induced PMF through the PLLs spectra observed in scanning tunneling spectroscopy (STS). This work provides a pathway to strain induced engineering and electro-mechanical graphene based devices.
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