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A structure-dynamics relationship in ratcheted colloids: resonance melting, dislocations, and defect clusters
Shubhendu Shekhar Khali1, Dipanjan Chakraborty, Debasish Chaudhuri
1Department of Physical Sciences, Indian Institute of Science Education and Research Mohali, Sector 81, S.A.S. Nagar, Manauli-140306, Punjab, India. chakraborty@iisermohali.ac.in.
Soft Matter
|February 21, 2020
Summary
A colloidal system
Area of Science:
- Soft condensed matter physics
- Statistical mechanics
- Non-equilibrium systems
Background:
- Colloidal dispersions exhibit complex phase behaviors.
- Stochastic ratchets can drive directed motion in particle systems.
- Non-equilibrium transitions differ from equilibrium melting.
Purpose of the Study:
- Investigate non-equilibrium melting in a 2D colloidal system.
- Determine the phase diagram under directed particle flow.
- Characterize the melting transition mechanism.
Main Methods:
- Molecular dynamics simulations of soft-core particles.
- Utilized a 1D stochastic flashing ratchet.
- Analyzed structure factor, order parameters, and correlation functions.
Main Results:
- A non-equilibrium melting transition was observed.
- The transition occurred at a resonant ratcheting frequency.
- A phase diagram was mapped in the ratcheting rate-mean density plane.
Conclusions:
- The melting is a continuous transition from solid to hexatic phase.
- Dislocation unbinding and defect cluster formation mediate the transition.
- System dynamics are governed by ratcheting and relaxation frequencies.
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