Visualizing Strain-Induced Pseudomagnetic Fields in Graphene through an hBN Magnifying Glass,Nano Letters

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Visualizing Strain-Induced Pseudomagnetic Fields in Graphene through an hBN Magnifying Glass
Nano Letters ( IF 9.6 ) Pub Date : 2017-04-14 00:00:00 , DOI: 10.1021/acs.nanolett.6b05228
Yuhang Jiang ₁ , Jinhai Mao ₁ , Junxi Duan ₁ , Xinyuan Lai ₁ , Kenji Watanabe ₂ , Takashi Taniguchi ₂ , Eva Y. Andrei ₁

Affiliation

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 moiré 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.

中文翻译：

通过hBN放大镜可视化石墨烯中的应变感应伪磁场

石墨烯的卓越性能是其二维蜂窝状晶格结构所固有的。它的低尺寸使得可以通过施加外力来重新排列原子，从而为机械控制电子特性提供了诱人的前景。在存在应变的情况下，石墨烯会产生伪磁场（PMF），该伪磁场将能带结构重建为伪Landau能级（PLL）。但是，仍然缺少实现，表征和控制PMF的可行途径。在这里，我们报告了一种在纳米柱上支撑的石墨烯膜中生成和表征PMF的方法。通过使用在扫描隧道显微镜下在六角形氮化硼衬底上形成的波纹图案的放大效果，可以直接测量局部应变。我们通过在扫描隧道光谱中观察到的PLL谱来量化应变诱导的PMF。这项工作为应变诱导工程和基于机电石墨烯的设备提供了一条途径。

更新日期：2017-04-25

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