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Depinning transition of self-propelled particles.
Arthur V Straube1, Felix Höfling1
1Freie Universität Berlin, Zuse Institute Berlin, Takustraße 7, 14195 Berlin, Germany and Department of Mathematics and Computer Science, Arnimallee 6, 14195 Berlin, Germany.
Physical Review. E
|February 7, 2025
Summary
Self-propelled particles in corrugated landscapes exhibit unique depinning transitions and creep regimes. Their drift velocity shows unusual nonlinear responses dependent on propulsion direction persistence and dimensionality.
Area of Science:
- Physics
- Statistical Mechanics
- Soft Matter
Background:
- Self-propelled particles (SPPs) in external potentials are crucial for understanding active matter.
- Depinning transitions in driven systems are fundamental but less explored for SPPs with persistent motion.
Purpose of the Study:
- Investigate the depinning transition and transport phenomena of SPPs in corrugated potentials.
- Analyze the influence of propulsion direction persistence on particle dynamics and diffusion.
Main Methods:
- Exact and semianalytic calculations for active Brownian particles.
- Analysis of scaling laws and dimensionality dependence.
- Extension to systems with bounded noise near saddle-node bifurcations.
Main Results:
- Observed a discontinuous change in the depinning transition.
- Identified a creep regime with superexponentially suppressed drift velocity.
- Revealed distinct giant diffusion phenomena dependent on particle reorientation dynamics.
Conclusions:
- The study elucidates unique nonlinear responses and diffusion behaviors in driven SPPs.
- Findings are relevant for understanding arrested active matter and biological systems like cell migration.
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