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Related Experiment Video

Updated: Sep 22, 2025

Forming, Confining, and Observing Microtubule-Based Active Nematics

Forming, Confining, and Observing Microtubule-Based Active Nematics

Published on: January 13, 2023

Inducing a bound state between active particles.

Pritha Dolai¹, Simon Krekels¹, Christian Maes¹

¹Instituut voor Theoretische Fysica, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium.

Physical Review. E

|May 20, 2022

Summary

This summary is machine-generated.

Two active particles can form bound states by interacting with a driven environment. This phenomenon, observed in run-and-tumble particles, resembles Cooper pairing in condensed matter physics.

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Area of Science:

Statistical Mechanics
Soft Matter Physics
Active Matter

Background:

Active particles in driven environments exhibit complex behaviors.
Understanding emergent phenomena like bound states is crucial in nonequilibrium systems.
Run-and-tumble particles model biological motility and synthetic active matter.

Purpose of the Study:

To investigate the conditions under which two active particles can form a bound state.
To explore the role of a driven nonequilibrium environment in particle interactions.
To draw analogies between active particle behavior and phenomena in other fields, such as condensed matter.

Main Methods:

Simulating two mutually noninteracting run-and-tumble probes on a ring.
Modeling short-range interactions between probes and driven colloids.
Analyzing particle behavior under conditions of timescale separation.

Main Results:

Two active particles can form a stable bound state when coupled to a driven nonequilibrium environment.
Bound state formation is favored at high particle persistence (low effective temperature).
An analogy to Cooper pairing in superconductivity is observed from a comoving frame perspective.

Conclusions:

Driven nonequilibrium environments can induce novel collective behaviors in active matter systems.
The run-and-tumble model provides insights into emergent bound states and their relation to fundamental physics concepts.
This work opens avenues for exploring quantum-like phenomena in classical active matter.