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Dynamical solid-liquid transition through oscillatory shear.

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Summary
This summary is machine-generated.

We numerically simulated a dynamical order-disorder transition in 3D systems under periodic shearing at low temperatures. A discontinuous transition from ordered to disordered states was observed, with amorphization resembling spinodal decomposition.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Statistical Mechanics

Background:

  • Understanding the dynamics of phase transitions in materials is crucial for predicting their behavior under external stimuli.
  • Nonequilibrium processes, especially those driven by mechanical forces like shearing, can lead to complex emergent behaviors in ordered systems.
  • Low-temperature dynamics can reveal fundamental mechanisms of structural transformations, distinct from thermal effects.

Purpose of the Study:

  • To numerically investigate the nonequilibrium dynamical order-disorder transition in 3D model systems.
  • To characterize the nature of the transition, specifically focusing on the role of periodic shearing at low temperatures.
  • To elucidate the underlying amorphization mechanism during this dynamical transition.

Main Methods:

  • Large-scale numerical simulations of 3D model systems.
  • Application of a periodic shearing protocol to induce a nonequilibrium state.
  • Analysis of the transition dynamics from an ideal crystalline state to a disordered steady state.
  • Investigation of the amorphization mechanism through simulation data.

Main Results:

  • Observation of a discontinuous dynamical transition from an ordered to a disordered steady state.
  • The amorphization mechanism near the transition point was found to be analogous to spinodal decomposition.
  • The study was conducted in three dimensions at low temperatures.

Conclusions:

  • Periodic shearing at low temperatures can drive a discontinuous order-disorder transition in 3D systems.
  • The observed amorphization process shares similarities with spinodal decomposition, a known mechanism for phase separation.
  • These findings provide insights into the nonequilibrium dynamics of structural transitions in crystalline materials.