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Coupling-induced synchronized motion and stochastic resonance in overdamped dimers
1National Institute of Technology Meghalaya, Department of Physics, Saitsohpen, Sohra, Meghalaya 793108, India.
Physical Review. E
|November 18, 2025
Summary
We investigated a dimer system in a bistable potential to model stochastic resonance (SR) energy harvesters. For weakly coupled dimers, the successful transition ratio peaks at the SR temperature, indicating optimal energy harvesting.
Area of Science:
- Physics
- Nonlinear Dynamics
- Statistical Mechanics
Background:
- Stochastic resonance (SR) is a phenomenon where a weak signal is enhanced by noise.
- Coupled particle systems offer unique dynamics compared to single particles, especially in SR.
- Modeling energy harvesters requires understanding the interplay of noise, coupling, and external forces.
Purpose of the Study:
- To explore stochastic resonance in an overdamped dimer system within a bistable potential.
- To investigate the impact of dimer coupling on successful transitions and SR characteristics.
- To analyze SR using various measures including input energy, hysteresis, phase lag, and a novel 'successful transition ratio'.
Main Methods:
- Simulated an overdamped dimer system with Lennard-Jones and harmonic potentials, including short-range interactions.
- Applied periodic forcing and varied noise intensity (temperature) to observe system dynamics.
- Quantified SR using input energy, hysteresis loop area, phase lag, response amplitude, and the successful transition ratio.
Main Results:
- The successful transition ratio is near unity for strongly coupled dimers.
- For weak and intermediate couplings, the successful transition ratio exhibits a peak with respect to noise intensity.
- Optimal SR, indicated by the successful transition ratio, is observed only for weakly coupled dimers near the characteristic SR temperature.
Conclusions:
- Dimer coupling significantly influences the dynamics and success of transitions in SR systems.
- The successful transition ratio provides a valuable metric for understanding SR in coupled systems.
- Weakly coupled dimers show the most promising behavior for SR-based energy harvesting applications.
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