Crystal image analysis using $2D$ synchrosqueezed transforms

TL;DR

This paper introduces efficient 2D synchrosqueezed transform algorithms for analyzing atomic crystal images, enabling extraction of defect, rotation, and deformation information with high robustness.

Contribution

The paper develops a novel band-limited 2D synchrosqueezed transform method tailored for detailed crystal image analysis, including defect detection and deformation measurement.

Findings

Methods effectively identify crystal defects as energy irregularities.

Algorithms accurately measure local crystal rotations.

Approach demonstrates robustness on synthetic and real images.

Abstract

We propose efficient algorithms based on a band-limited version of 2D synchrosqueezed transforms to extract mesoscopic and microscopic information from atomic crystal images. The methods analyze atomic crystal images as an assemblage of non-overlapping segments of 2D general intrinsic mode type functions, which are superpositions of non-linear wave-like components. In particular, crystal defects are interpreted as the irregularity of local energy; crystal rotations are described as the angle deviation of local wave vectors from their references; the gradient of a crystal elastic deformation can be obtained by a linear system generated by local wave vectors. Several numerical examples of synthetic and real crystal images are provided to illustrate the efficiency, robustness, and reliability of our methods.