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Absolute negative mobility induced by thermal equilibrium fluctuations.

L Machura1, M Kostur, P Talkner

  • 1Institute of Physics, University of Silesia, 40-007 Katowice, Poland.

Physical Review Letters
|March 16, 2007
PubMed
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Researchers discovered absolute negative mobility (ANM) in inertial Brownian particles. This phenomenon causes particles to move backward against a bias, driven by fluctuations or deterministic dynamics, and is verified in Josephson junction devices.

Area of Science:

  • Physics
  • Nonlinear Dynamics
  • Statistical Mechanics

Background:

  • Brownian particles in periodic potentials exhibit complex dynamics under external forces.
  • Understanding directed transport in driven systems is crucial for statistical mechanics.
  • Inertial effects and fluctuations significantly influence particle motion.

Purpose of the Study:

  • To identify and characterize a novel transport phenomenon in driven systems.
  • To investigate the role of inertial effects and thermal fluctuations in particle transport.
  • To experimentally verify the predicted transport phenomenon in a physical system.

Main Methods:

  • Theoretical analysis of inertial Brownian particles in one-dimensional periodic potentials.
  • Investigation of systems driven by time-periodic and constant forces.

Related Experiment Videos

  • Experimental realization using a resistively and capacitively shunted Josephson junction.

    • Main Results:

    • Identification of absolute negative mobility (ANM) within specific parameter regimes.
    • Demonstration that ANM can be induced by thermal fluctuations or solely by deterministic dynamics.
    • Experimental verification of ANM in a Josephson junction device.

    Conclusions:

    • Absolute negative mobility is a novel transport phenomenon driven by inertial effects and fluctuations.
    • The study provides a framework for understanding and experimentally observing ANM.
    • Josephson junction devices serve as a viable platform for realizing this transport mechanism.