Diffusion of noiseless active particles in a planar convection array.

Area of Science:

• Physics
• Nonlinear dynamics
• Statistical mechanics

Background:

• Active particles exhibit complex behaviors in patterned environments.
• Convection rolls create dynamic potential landscapes for particles.

Purpose of the Study:

• Investigate the dynamics of active particles in a square lattice of convection rolls.
• Identify different diffusion and motion regimes based on self-propulsion speed.

Main Methods:

• Analytical investigation of particle dynamics.
• Numerical simulations of particle trajectories.
• Analysis of diffusion coefficients and trajectory characteristics.

Main Results:

• Below a self-propulsion speed threshold, particles diffuse or become trapped.
• Two chaotic diffusion regimes were identified: normal diffusion and superdiffusive running.
• Chaotic diffusion transitions to ballistic motion at very high speeds.

Conclusions:

• The particle's dynamics are highly sensitive to self-propulsion speed.
• Distinct regimes of diffusion and motion emerge in this system.
• This study provides insights into active matter transport in complex flows.