发表机构
Technical University of Denmark; Electron Scattering Solutions; University of California Berkeley（丹麦技术大学; 电子散射解决方案公司; 加州大学伯克利分校）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究针对高分辨率透射电子显微镜（HRTEM）的单电子相位衬度成像，提出自相干长度ls(ΔE)模型，经六方氮化硼的能量过滤HRTEM图像验证，确定能量损失诱导的相位噪声为单电子可见性极限。
AI 中文摘要
高分辨率透射电子显微镜（HRTEM）中，相干晶格衬度向能量损失区域的延伸，可通过能量/时间不确定极限下的类脉冲电子-样品相互作用描述。该相互作用在任何伴随能量损失的相干非弹性散射事件中，通过电子自干涉生成波包。此波包的宽度由自相干长度ls(ΔE)表征，该长度可预测，因为相位涨落的期望值设定了约1弧度的固有退相干相位。在此情况下，晶格参数为a的晶体样品的干涉衬度可见性，受限于自相干照射样品区域内类瑞利传递因子P(ls,a)。该模型经六方氮化硼（hexagonal BN）的能量过滤HRTEM图像验证，确定能量损失诱导的相位噪声为单电子可见性极限，其与系综相干性或计数统计噪声导致的分辨率限制不同。
英文摘要
The extension of coherent lattice contrast into the energy loss region in high-resolution transmission electron microscopy (HRTEM) is described by a pulse-like electron-sample interaction in the energy/time uncertainty limit. It generates a wave packet by electron self-interference in any coherent-inelastic scattering event with energy loss. The width of this wave packet is characterized by a self-coherence length ls(ΔE) that is predictable because an intrinsic decoherence phase around one radian is set by the expectation value for phase fluctuations. In this case the visibility of interference contrast from a crystalline sample with lattice parameter a is limited by a Rayleigh-like transfer factor P(ls, a) in the self-coherently illuminated sample area. The model is verified by energy-filtered HRTEM images of hexagonal BN and identifies energy-loss-induced phase noise as a single-electron visibility limit distinct from resolution limitations caused by ensemble-coherence or counting-statistical noise.
Comments4 pages, 3 figures
