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Atomic Resolution Defocused Electron Ptychography at Low Dose with a Fast, Direct Electron Detector
Jiamei Song1, Christopher S Allen2,3, Si Gao1
1College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, People's Republic of China.
Abstract:
Electron ptychography has recently attracted considerable interest for high resolution phase-sensitive imaging. However, to date studies have been mainly limited to radiation resistant samples as the electron dose required to record a ptychographic dataset is too high for use with beam-sensitive materials. Here we report defocused electron ptychography using a fast, direct-counting detector to reconstruct the transmission function, which is in turn related to the electrostatic potential of a two-dimensional material at atomic resolution under various low dose conditions.
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