Reconfiguring active particles by electrostatic imbalance.

Area of Science:

• Condensed matter physics
• Active matter physics

Background:

• Active materials exhibit collective dynamic behavior.
• Controlling self-organization in active matter is challenging.

Purpose of the Study:

• To present a general strategy for reconfiguring active particles into various collective states.
• To demonstrate control over active particle self-organization using imbalanced interactions.

Main Methods:

• Computer simulations of self-propelled colloidal spheres.
• Experimental validation using 2D metal-dielectric Janus colloids under AC electric fields.
• Tuning particle motility and interactions via frequency-dependent dielectric responses.

Main Results:

• Achieved diverse collective states (swarms, chains, clusters, gases) from a single particle type.
• Observed large-scale polar waves, vortices, and jammed domains.
• Demonstrated persistent, time-dependent evolution of collective structures.

Conclusions:

• Asymmetry-driven active self-organization provides a versatile method for controlling active matter.
• The strategy is applicable to both 2D and 3D active materials.
• This approach opens new avenues for designing and manipulating active materials.