Phonon resistance from dislocation scattering is often divided into short-range core interactions and long-range strain field interactions. Using electron energy-loss spectroscopy on a GaN dislocation, we report observations of vibrational modes localized at specific core atoms (short-range) and strain-driven phonon energy shifts around the dislocation (long-range). Ab initio calculations support these findings and draw out additional details. This study reveals atomically resolved vibrational spectra of dislocations, thus offering insights for engineering improved material functionalities.
@article{arxiv.2409.10628,
title = {Single-atom-resolved vibrational spectroscopy of a dislocation},
author = {Hailing Jiang and Tao Wang and Zhenyu Zhang and Ruochen Shi and Xifan Xu and Bowen Sheng and Fang Liu and Weikun Ge and Ping Wang and Bo Shen and Peng Gao and Lucas R Lindsay and Xinqiang Wang},
journal= {arXiv preprint arXiv:2409.10628},
year = {2024}
}