Abstract

Bragg interferometry (BI) is an imaging technique based on four-dimensional scanning transmission electron microscopy (4D-STEM) wherein the intensities of select overlapping Bragg disks are fit or more qualitatively analyzed to determine local stacking order. This work analyzes limitations of BI for extracting moiré-scale strain, compares numerical approaches for strain extraction, and illustrates current capabilities using simulated multi-slice data and re-processing of published data.

Abstract

Bragg interferometry (BI) is an imaging technique based on four-dimensional scanning transmission electron microscopy (4D-STEM) wherein the intensities of select overlapping Bragg disks are fit or more qualitatively analyzed to determine local stacking order. This work analyzes limitations of BI for extracting moiré-scale strain, compares numerical approaches for strain extraction, and illustrates current capabilities using simulated multi-slice data and re-processing of published data.

Abstract

Bragg interferometry (BI) is an imaging technique based on four-dimensional scanning transmission electron microscopy (4D-STEM) wherein the intensities of select overlapping Bragg disks are fit or more qualitatively analyzed to determine local stacking order. This work analyzes limitations of BI for extracting moiré-scale strain, compares numerical approaches for strain extraction, and illustrates current capabilities using simulated multi-slice data and re-processing of published data.

Abstract

Bragg interferometry (BI) is an imaging technique based on four-dimensional scanning transmission electron microscopy (4D-STEM) wherein the intensities of select overlapping Bragg disks are fit or more qualitatively analyzed to determine local stacking order. This work analyzes limitations of BI for extracting moiré-scale strain, compares numerical approaches for strain extraction, and illustrates current capabilities using simulated multi-slice data and re-processing of published data.