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September 16, 2025Nano Letters

Single-Atom-Resolved Vibrational Spectroscopy of a Dislocation

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Electron energy-loss spectroscopy reveals localized vibrational modes in GaN dislocations, indicating phonon scattering mechanisms.

Phonon energy shifts due to dislocation strain fields affect heat transport in GaN, revealing localized overheating.
Electron energy-loss spectroscopy uncovered vibrational modes localized at dislocation core atoms, highlighting short-range interactions.
Ab initio calculations confirmed the findings of localized vibrational modes and elucidated strain effects on phonons.
This work sets a new standard for studying defect-induced phonon scattering at the single-atom level in materials.

Jiang et al. (2025) studied this question.

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