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Two-dimensional melting far from equilibrium in a granular monolayer.
1Department of Physics and Astronomy, The University of Kansas, Lawrence, KS 66045, USA. jolafsen@ku.edu
Physical Review Letters
|October 4, 2005
Summary
We studied vibrated spheres transitioning from solid to liquid. This continuous transition, driven by dislocations, mirrors equilibrium melting despite the system being out of equilibrium.
Area of Science:
- Granular physics
- Condensed matter physics
Background:
- Vibrated granular materials can exhibit complex phase behaviors.
- Understanding phase transitions in non-equilibrium systems is a key challenge.
Purpose of the Study:
- To experimentally investigate the solid-to-liquid phase transition in a vibrated granular monolayer.
- To characterize the nature of the transition and compare it to equilibrium melting.
Main Methods:
- A monolayer of spheres was subjected to controlled vertical vibrations.
- Measurements included dislocation density and correlation functions (positional and orientational).
Main Results:
- A continuous phase transition from a hexagonally ordered solid to a disordered liquid was observed.
- Dislocation-mediated melting was identified as the mechanism.
- The transition showed similarities to equilibrium melting of hard disks.
Conclusions:
- The granular monolayer undergoes a dislocation-mediated continuous transition.
- Non-equilibrium granular systems can exhibit melting behavior analogous to equilibrium systems.