State behaviour and dynamics of self-propelled Brownian squares: a simulation study

Area of Science:

• Statistical Mechanics
• Soft Matter Physics
• Computational Physics

Background:

• Understanding the collective behavior of active matter is crucial in physics.
• Brownian dynamics simulations are a key tool for studying particle systems.

Purpose of the Study:

• To investigate the phase behavior of self-propelled and Brownian squares.
• To analyze the influence of self-propulsion magnitude and density on system states.

Main Methods:

• Brownian dynamics simulations were employed.
• System behavior was studied as a function of self-propulsion and density.

Main Results:

• A transition from a fluid state to phase coexistence was observed with increased self-propulsion and density.
• Oscillations between fluid and phase-coexisting states occurred near the transition due to force accumulation.
• Super-diffusive behavior was identified in the coarsening regime.

Conclusions:

• Self-propelled Brownian squares exhibit rich phase behavior and dynamic transitions.
• Force accumulation in dense phases drives oscillatory dynamics.
• The coarsening dynamics are non-standard, showing super-diffusion.