论文标题
跨2D异质结构的静电和动力学的空间映射
Spatial Mapping of Electrostatics and Dynamics across 2D Heterostructures
论文作者
论文摘要
原位电子显微镜是理解驱动2D结构中新现象的机制的关键工具。不幸的是，由于各种实际挑战，技术相关的2D异质结构证明对电子显微镜的解决方案有挑战。在这里，我们使用差分相对比成像技术来构建一种方法，用于在此类材料中使用纳米级精度进行电气操作期间局部静电场。我们发现，通过将传统的DPC设置与高通滤波器相结合，我们可以在很大程度上消除从短距离原子电位中产生的电动波动。使用这种方法，可以将先验的电场期望与实验得出的值直接进行比较，以容易识别不均匀性和潜在有问题的区域。我们使用此平台分析HBN和MOS2层之间的电场和电荷密度分布。
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.
