We show that memory, in the form of underdamped angular dynamics, is a crucial ingredient for the collective properties of self-propelled particles. Using Vicsek-style models with an Ornstein-Uhlenbeck process acting on angular velocity, we uncover a rich variety of collective phases not observed in usual overdamped systems, including vortex lattices and active foams. In a model with strictly nematic interactions the smectic arrangement of Vicsek waves giving rise to global polar order is observed. We also provide a calculation of the effective interaction between vortices in the case where a telegraphic noise process is at play, explaining thus the emergence and structure of the vortex lattices observed here and in motility assay experiments.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/PhysRevLett.114.168001 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Motility-induced collapse of an active Brownian particle polymer chain.
Phys Chem Chem Phys
December 2024
Semenov Federal Research Center for Chemical Physics, Kosygina, 4, 119991 Moscow, Russia.
The ability of particles to transform absorbed energy into translational movements brings peculiar order into nonequilibrium matter. Connected together into a chain, these particles collectively behave completely differently from well-known equilibrium polymers. Examples of such systems vary from nanoscale to macroscopic objects.
View Article and Find Full Text PDFBehavior of chemically powered Janus colloids in lyotropic chromonic liquid crystal.
Phys Rev E
November 2024
Department of Physics, University of California Merced, Merced, California 95343, USA.
Platinum-coated Janus colloids exhibit self-propelled motion in aqueous solution via the catalytic decomposition of hydrogen peroxide. Here, we report their motion in a uniformly aligned nematic phase of lyotropic chromonic liquid crystal, disodium cromoglycate (DSCG). When active Janus colloids are placed in DSCG, we find that the anisotropy of the liquid crystal imposes a strong sense of direction to their motion; the Janus colloids tend to move parallel to the nematic director.
View Article and Find Full Text PDFActive motion can be beneficial for target search with resetting in a thermal environment.
Phys Rev E
November 2024
School of Physics, Korea Institute for Advanced Study, Seoul 02455, Republic of Korea.
Stochastic resetting has recently emerged as an efficient target-searching strategy in various physical and biological systems. The efficiency of this strategy depends on the type of environmental noise, whether it is thermal or telegraphic (active). While the impact of each noise type on a search process has been investigated separately, their combined effects have not been explored.
View Article and Find Full Text PDFEnhanced catalytic degradation of methylene blue using self-propelled Janus micromotors: An insight into decomposing characteristics of passive and active hematite particles studded with Pt nanoparticles.
J Chem Phys
December 2024
Department of Chemical Engineering, Indian Institute of Technology, Ropar, Rupnagar, India.
Recent advancements in catalytic micromotors have shown significant potential for environmental applications, yet challenges such as particle agglomeration persist. In this study, we compare the degradation of methylene blue using hematite particles fully coated with platinum and those partially decorated with platinum. The selective decoration, confirmed through techniques like EDX, FESEM, TEM, and XPS, plays a crucial role in the micromotors' behavior.
View Article and Find Full Text PDFEnhanced rotational diffusion and spontaneous rotation of an active Janus disk in a complex fluid.
Soft Matter
December 2024
Aragon Institute of Engineering Research (I3A), University of Zaragoza, Zaragoza, Spain.
Article Synopsis
- Active colloids like Janus disks behave differently in complex fluids compared to simple fluids, showing enhanced diffusion and instabilities.
- This study uses simulations to model the interactions between a self-propelling Janus disk and a complex fluid, revealing how these interactions affect rotational motion and diffusion.
- Findings suggest that increasing the disk's speed could lead to spontaneous rotation and significantly greater diffusion rates, depending on the fluid's composition and particle interactions, making the model applicable to various active systems.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!