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Antipersistent random walk in a two state flashing magnetic potential.

Pietro Tierno¹, Francesc Sagués, Tom H Johansen

¹Estructura i Constituents de la Matèria, Universitat de Barcelona, Spain. ptierno@ub.edu

Physical Review Letters

|September 26, 2012

Summary

Paramagnetic colloids exhibit subdiffusive motion under a flashing potential. Their random walk behavior can transition to enhanced diffusion, similar to a random walk on a random walk model.

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Area of Science:

Colloid science
Statistical physics
Soft matter physics

Background:

Understanding particle dynamics in complex potentials is crucial for nanotechnology.
Subdiffusion is a common phenomenon in disordered systems.

Purpose of the Study:

To investigate the subdiffusive dynamics of paramagnetic colloids in a flashing potential.
To analyze the transition from subdiffusive to enhanced diffusive behavior.

Main Methods:

Periodic modulation of a magnetic bubble lattice to create a two-state flashing potential.
Analysis of particle trajectories to determine their random walk characteristics.

Main Results:

Paramagnetic colloids exhibit antipersistent random walk motion.
A crossover from subdiffusive to enhanced diffusive behavior was observed for specific field parameters.
The subdiffusive process was found to be stationary (no aging).

Conclusions:

The observed subdiffusive dynamics are similar to the random walk on a random walk model.
Flashing potentials offer a method to control and modify colloidal particle transport.