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Disentangling defects and sound modes in disordered solids.

Sven Wijtmans1, M Lisa Manning

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We developed a novel method to isolate localized defects in disordered solids. These defects predict plastic rearrangements, offering insights into solid mechanics and plasticity theories.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid Mechanics

Background:

  • Disordered solids exhibit complex vibrational modes.
  • Distinguishing localized defects from extended modes is challenging.
  • Understanding these defects is crucial for predicting material behavior.

Purpose of the Study:

  • To develop a new method for isolating localized defects in disordered solids.
  • To investigate the relationship between localized defects and plastic rearrangements.
  • To characterize defect properties for mesoscopic plasticity theory.

Main Methods:

  • Augmenting particle interactions with a high-pass filter artificial potential.
  • Preserving small-scale structures while increasing frequencies of extended modes.
  • Analyzing remaining low-frequency modes as "bare" defects.

Main Results:

  • Successfully isolated exponentially localized "bare" defects.
  • Demonstrated that these defects are strong predictors of plastic rearrangements.
  • Characterized defect properties: energy barriers, number density, and size.

Conclusions:

  • The developed method effectively isolates localized defects.
  • Localized defects are key indicators of plastic deformation in disordered solids.
  • Characterized defect properties provide a foundation for refining continuum plasticity models.