基于外推辅助相位恢复的石墨烯及其点缺陷原子分辨结构研究
Atomically resolved structural determination of graphene and its point defects via extrapolation assisted phase retrieval
摘要：
以前报道的晶体结构获得的迭代相位恢复重建其衍射图案似乎是免费的显示任何不规则性或缺陷的晶格，这似乎是不现实的。我们在这里证明，包括它的原子缺陷的结构可以明确地恢复从它的衍射图案单独通过应用直接的相位恢复程序不依赖于对象形状的先验信息。原子晶格中的单个点缺陷是很明显的。传统的相位恢复程序假设各向同性散射。我们表明，当处理电子时，由于各向异性，强前向散射特定于电子，样品的定量正确的传输函数不能被检索。我们总结了这种相位恢复方法的条件，并表明，衍射图案可以外推超出原始记录，甚至揭示以前不可见的布拉格峰。这样的外推波场图案导致重建中的增强的空间分辨率。
英文摘要：
Previously reported crystalline structures obtained by an iterative phase retrieval reconstruction of their diffraction patterns seem to be free from displaying any irregularities or defects in the lattice, which appears to be unrealistic. We demonstrate here that the structure of a nanocrystal including its atomic defects can unambiguously be recovered from its diffraction pattern alone by applying a direct phase retrieval procedure not relying on prior information of the object shape. Individual point defects in the atomic lattice are clearly apparent. Conventional phase retrieval routines assume isotropic scattering. We show that when dealing with electrons, the quantitatively correct transmission function of the sample cannot be retrieved due to anisotropic, strong forward scattering specific to electrons. We summarize the conditions for this phase retrieval method and show that the diffraction pattern can be extrapolated beyond the original record to even reveal formerly not visible Bragg peaks. Such extrapolated wave field pattern leads to enhanced spatial resolution in the reconstruction.
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。
