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Depinning by fracture in a glassy background
M B Hastings1, C J Olson Reichhardt, C Reichhardt
1Center for Nonlinear Studies and Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Physical Review Letters
|April 12, 2003
Summary
A single particle driven through a simulated glass medium exhibits power-law velocity behavior. This phenomenon is explained by a fracture model of cooperative distortions induced in the surrounding soft matter.
Area of Science:
- Soft Matter Physics
- Computational Materials Science
Background:
- Understanding particle dynamics in disordered media is crucial for soft matter science.
- Simulated glasses provide a controllable environment to study complex particle interactions.
Purpose of the Study:
- To investigate the velocity dynamics of a single driven particle in a 2D simulated glass.
- To theoretically model the cooperative distortions induced by the particle and explain observed behaviors.
Main Methods:
- Simulating a single particle moving through a 2D glass of smaller particles.
- Analyzing particle velocity data for power-law relationships.
- Developing a theoretical fracture model to explain medium distortions.
Main Results:
- The particle's velocity follows a robust power law, even above the driving threshold.
- Cooperative distortions in the glass medium are induced by the driven particle.
- The theoretical fracture model successfully predicts the observed power-law behavior.
Conclusions:
- The power-law velocity of a driven particle in a simulated glass is a consequence of cooperative distortions.
- A fracture model provides a theoretical framework for understanding these dynamics.
- Findings have implications for designing experiments to probe soft matter systems.