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Predicting plasticity with soft vibrational modes: from dislocations to glasses.

Jörg Rottler1, Samuel S Schoenholz2, Andrea J Liu2

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Summary

Soft spots, identified by low-frequency vibrational modes, reveal flow defects in solids. These regions encode spatial and directional information, predicting atomic motion during rearrangements in various materials.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Solid mechanics

Background:

  • Identifying flow defects in solids is crucial for understanding material behavior.
  • Traditional methods often struggle with complex or disordered materials.

Purpose of the Study:

  • To introduce a universal tool for identifying flow defects in solids using soft spots.
  • To demonstrate how soft spots encode both spatial and directional information.

Main Methods:

  • Analysis of quasilocalized low-frequency modes in the vibrational spectrum.
  • Localization of phonon modes at defect cores (e.g., dislocations).
  • Correlation of particle directors within soft spots with atomic displacements.

Main Results:

  • Soft spots serve as a universal indicator of flow defects in solids.
  • The location and particle directors within soft spots provide spatial and directional defect information.
  • Low-frequency phonon modes accurately predict atomic motion during dislocation glide in various solid types.

Conclusions:

  • Soft spots derived from vibrational spectra offer a powerful new method for defect identification.
  • This approach is applicable to single crystals, polycrystals, and disordered solids.
  • Understanding soft spots enhances predictions of material deformation and failure.