arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2012.13842cond-mat.mtrl-scicond-mat.mes-hall
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二维异质结构静电场和动力学场的空间映射

Spatial Mapping of Electrostatics and Dynamics across 2D Heterostructures

Akshay A. Murthy, Stephanie M. Ribet, Teodor K. Stanev, Pufan Liu, Kenji Watanabe, Takashi Taniguchi, Nathaniel P. Stern, Roberto dos Reis, Vinayak P. Dravid

摘要:

原位电子显微镜是理解二维结构中驱动新现象的机制的关键工具。不幸的是,由于各种实际的挑战,技术相关的2D异质结证明具有挑战性的电子显微镜解决。在这里,我们使用微分相衬成像技术,建立一个方法,用于探测局部静电场在电操作与纳米级精度在这样的材料。我们发现,通过结合一个传统的DPC设置与高通滤波器,我们可以在很大程度上消除从短程原子势发出的电波动。利用该方法,先验电场期望可以直接与实验导出的值进行比较,以容易地识别不均匀性和潜在的问题区域。我们使用该平台来分析hBN和MoS 2层之间的电场和电荷密度分布。

英文摘要:

In situ electron microscopy is a key tool for understanding the mechanisms driving novel phenomena in 2D structures. Unfortunately, due to various practical challenges, technologically relevant 2D heterostructures prove challenging to address with electron microscopy. Here, we use the differential phase contrast imaging technique to build a methodology for probing local electrostatic fields during electrical operation with nanoscale precision in such materials. We find that by combining a traditional DPC setup with a high pass filter, we can largely eliminate electric fluctuations emanating from short-range atomic potentials. With this method, a priori electric field expectations can be directly compared with experimentally derived values to readily identify inhomogeneities and potentially problematic regions. We use this platform to analyze the electric field and charge density distribution across layers of hBN and MoS2.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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