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Effect of correlated noises on directed motion
Pinaki Chaudhury1, Bipul Mukherjee, Sudip Chattopadhyay
1Department of Chemistry, University of Calcutta, Kolkata 700009, India.
Physical Chemistry Chemical Physics : PCCP
|October 11, 2008
Summary
Directed motion of Brownian particles is enhanced by correlated noise. Increasing noise correlation boosts steady-state current, offering potential for experimental control in transport phenomena.
Area of Science:
- Statistical physics
- Non-equilibrium systems
Background:
- Brownian motion describes particle movement due to random collisions.
- Langevin equation models Brownian particles with friction and noise.
- State-dependent friction introduces complexity in particle dynamics.
Purpose of the Study:
- Investigate directed motion of Brownian particles.
- Analyze effects of correlated noise on particle transport.
- Examine particle behavior in a symmetric periodic potential.
Main Methods:
- Utilized the Langevin equation framework.
- Incorporated state-dependent friction.
- Introduced two external correlated noises.
- Studied transport in a symmetric periodic potential.
Main Results:
- Steady-state current increases with the degree of correlation.
- Noise correlation significantly impacts Brownian particle transport.
- Directed motion is controllable via correlation levels.
Conclusions:
- Correlated noise can enhance directed motion of Brownian particles.
- Controlling noise correlation offers a method to boost particle current.
- Findings suggest potential for experimental design in transport enhancement.
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