Visualizing Strain-Induced Pseudomagnetic Fields in Graphene through an hBN Magnifying Glass
Visualizing Strain-Induced Pseudomagnetic Fields in Graphene through an hBN Magnifying Glass
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DOI：
10.1021/acs.nanolett.6b05228
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发表时间：
2017-05-01
期刊：
影响因子：
10.8
通讯作者：
Andrei, Eva Y.
中科院分区：
文献类型：
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作者：
Jiang, Yuhang;Mao, Jinhai;Andrei, Eva Y.
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，这为机械控制电子性质提供了有趣的前景。在存在应变的情况下，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，我们报告的方法来生成和表征PMFs在纳米柱上支持的石墨烯膜。利用扫描隧道显微镜下六方氮化硼衬底上形成的莫尔条纹的放大效应，可以直接测量局部应变。我们，量化的应变引起的PMF通过PLL光谱，在扫描隧道光谱中观察到。这项工作提供了一种途径，应变诱导工程和机电石墨烯为基础的设备。
Graphene's remarkable properties are inherent to its two-dimensional 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 pseudomagnetic field (PMF) that 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 nanopillars. A direct measure of the local strain is achieved by using the magnifying effect of the moire pattern formed against a hexagonal boron nitride substrate under scanning tunneling microscopy. We,quantify the strain-induced PMF through the PLLs spectra,observed in scanning tunneling spectroscopy. This work provides a pathway to strain induced-engineering and electro-mechanical graphene-based devices.