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Disorder induced diffusive transport in ratchets.

M N Popescu1, C M Arizmendi, A L Salas-Brito

  • 1Department of Physics, Emory University, Atlanta, Georgia 30322, USA.

Physical Review Letters
|October 6, 2000
PubMed
Summary
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Quenched disorder introduces chaotic diffusive motion to driven particles in asymmetric potentials, enhancing transport beyond regular drift. This finding has implications for nanoscale surface experiments and particle separation technologies.

Area of Science:

  • Physics
  • Statistical Mechanics
  • Nonlinear Dynamics

Background:

  • Particle motion in periodic potentials is fundamental to many physical systems.
  • Understanding transport mechanisms under external driving forces is crucial.
  • Disorder can significantly alter system dynamics, leading to complex behaviors.

Purpose of the Study:

  • To investigate the impact of quenched disorder on the overdamped motion of a driven particle.
  • To analyze how disorder modifies transport properties in asymmetric periodic potentials.
  • To explore potential applications of these findings in nanotechnology.

Main Methods:

  • Simulations of a driven particle in a periodic, asymmetric potential with quenched disorder.
  • Analysis of particle trajectories to quantify drift and diffusive motion.

Related Experiment Videos

  • Comparison of dynamics with and without quenched disorder.

    • Main Results:

    • Quenched disorder induces significant chaotic "diffusive" motion.
    • This diffusive motion supplements the regular drift observed in the unperturbed potential.
    • The interplay between driving, potential asymmetry, and disorder dictates the overall transport.

    Conclusions:

    • Quenched disorder fundamentally alters particle transport in driven asymmetric potentials.
    • The induced chaotic diffusion offers new mechanisms for particle manipulation.
    • Potential applications include advanced nanoscale surface engineering and efficient particle separation techniques.