The 2019 Motile Active Matter Roadmap

Abstract

Activity and autonomous motion are fundamental in living and engineering systems. This has stimulated the new field of active matter in recent years, which focuses on the physical aspects of propulsion mechanisms, and on motility-induced emergent collective behavior of a larger number of identical agents. The scale of agents ranges from nanomotors and microswimmers, to cells, fish, birds, and people. Inspired by biological microswimmers, various designs of autonomous synthetic nano- and micromachines have been proposed. Such machines provide the basis for multifunctional, highly responsive, intelligent (artificial) active materials, which exhibit emergent behavior and the ability to perform tasks in response to external stimuli. A major challenge for understanding and designing active matter is their inherent nonequilibrium nature due to persistent energy consumption, which invalidates equilibrium concepts such as free energy, detailed balance, and time-reversal symmetry. Unraveling, predicting, and controlling the behavior of active matter is a truly interdisciplinary endeavor at the interface of biology, chemistry, ecology, engineering, mathematics, and physics. The vast complexity of phenomena and mechanisms involved in the self-organization and dynamics of motile active matter comprises a major challenge. Hence, to advance, and eventually reach a comprehensive understanding, this important research area requires a concerted, synergetic approach of the various disciplines.

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• Entropons as collective excitations in active solids
• The 2024 Motile Active Matter Roadmap
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• Emergent vortices and phase separation in systems of chiral active particles with dipolar interactions
• Activity-controlled clogging and unclogging of micro-channels
• Active Refrigerators Powered by Inertia
• Hydrodynamic lift of a two-dimensional liquid domain with odd viscosity
• Time-dependent properties of interacting active matter: dynamical behavior of one-dimensional systems of self-propelled particles
• Collective effects in confined Active Brownian Particles
• Intermittent Attractive Interactions Lead to Microphase Separation in Non-motile Active Matter
• Critical behavior of active Brownian particles: Connection to field theories
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• Jeffery's orbits and microswimmers in flows: A theoretical review
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• Time-correlation functions for odd Langevin systems
• Defect Solutions of the Non-reciprocal Cahn-Hilliard Model: Spirals and Targets
• Direct evaluation of rare events in active matter from variational path sampling
• Interface roughening in nonequilibrium phase-separated systems
• Inertia drives a flocking phase transition in viscous active fluids
• Motility-Induced Clustering and Meso-Scale Turbulence in Active Polar Fluids
• Hydrodynamics of polymers in an active bath
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• Noisy Pursuit and Pattern Formation of Self-Steering Active Particles
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• Magnetic microswimmers exhibit Bose-Einstein-like condensation
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• Inertial effects on rectification and diffusion of active Brownian particles in an asymmetric channel
• Mechanical feedback controls the emergence of dynamical memory in growing tissue monolayers
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• Odd elasticity and topological waves in active surfaces
• Motility Induced Phase Separation and Frustration in Active Matter Swarmalators
• Anisotropic electrostatic screening of charged colloids in nematic solvents
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• Active Brownian motion with speed fluctuations in arbitrary dimensions: exact calculation of moments and dynamical crossovers
• Epidemic processes on self-propelled particles: continuum and agent-based modelling
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• Active nematics on flat surfaces: from droplet motility and scission to active wetting
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• Hunting active Brownian particles: Learning optimal behavior
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• The Many Faces of Fluctuation-Dissipation Relations Out of Equilibrium
• Equilibrium Stochastic Delay Processes
• From predicting to learning dissipation from pair correlations of active liquids
• When does an active bath behave as an equilibrium one?
• Nonequilibrium fluctuations of chemical reaction networks at criticality: The Schlögl model as paradigmatic case
• Pattern selection and the route to turbulence in incompressible polar active fluids
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• Generalized persistence dynamics for active motion
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• Fluctuation Dissipation Relations for Active Field Theories
• Active Polymer Behavior in Two Dimensions: A Comparative Analysis of Tangential and Push-Pull Models
• Premelting controlled active matter in ice
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• An equation of state for active matter
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• Power-law correlation in the homogeneous disordered state of anisotropically self-propelled systems
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• Acoustic signaling enables collective perception and control in active matter systems
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• Vortex pattern stabilization in thin films resulting from shear thickening of active suspensions
• Wafer-Scale Fabrication of Hierarchically Porous Silicon and Silica Glass by Active Nanoparticle-Assisted Chemical Etching and Pseudomorphic Thermal Oxidation
• Ordering kinetics in the active Ising model
• Effective Dynamics of Tracer in Active Bath: A Mean-field Theory Study
• Mean-field theory for the structure of strongly interacting active liquids
• Fluctuation Theorems for Heat exchanges between passive and active baths
• Chirality Reversing Active Brownian Motion in Two Dimensions
• Active Crowds
• Binary Mixtures of Intelligent Active Brownian Particles with Visual Perception
• Deterministic active particles in the overactive limit
• Fluctuation Dissipation Relations for the Non-Reciprocal Cahn-Hilliard Model
• Consequence of anisotropy on flocking: the discretized Vicsek model
• 3D model for surface accumulation of chiral and non-chiral microswimmers
• Coupling an elastic string to an active bath: the emergence of inverse damping
• Viscous tweezers: controlling particle orientation with viscosity
• Reinforcement Learning for Active Matter
• Nonequilibrium dynamical structure of a dilute suspension of active particles in a viscoelastic fluid
• Lattice Boltzmann simulations of two linear microswimmers using the immersed boundary method
• Self-chemophoresis in the thin diffuse interface approximation
• Motility-induced crystallization and rotating crystallites
• Anti-aligning Self-propelled Model of Two Species: Emergence of Self-organized Heterogeneous Aligned and Clustered Order
• Exact Results in Stochastic Processes with Division, Death, and Diffusion: Spatial Correlations, Marginal Entropy Production, and Macroscopic Currents
• Anti-hyperuniform Critical States of Active Topological Defects
• Boosting micromachine studies with Stokesian Dynamics
• Nonmonotonic diffusion in sheared active suspensions of squirmers
• Non-reciprocal mixtures in suspension: the role of hydrodynamic interactions
• Dynamical Spreading and Memory Retention Under Power Law Potential
• Jerky chiral active particles
• Simulations of Three-dimensional Nematic Guidance of Microswimmers
• Time-correlated forces and biological variability in cell motility
• The regularized Stokeslets method applied to the three-sphere swimmer model
• Curvature dependent dynamics of a bacterium confined in a giant unilamellar vesicle
• Correlated escape of active particles across a potential barrier
• Phase separation of chemokinetic active particles
• Motility and self propulsion of active droplets
• Aspect-ratio-dependent void formation in active rhomboidal and elliptical particle systems
• A Data-Driven Statistical Description for the Hydrodynamics of Active Matter
• Optimal Turbulent Transport in Microswimmer Suspensions
• Dynamic control of the Bose-Einstein-like condensation transition in scalar active matter
• Simulation of a flat folding nano-swimmer confined in a nanopore
• State Diagram of the Non-Reciprocal Cahn-Hilliard Model and the Effects of Symmetry
• Mass-based separation of active Brownian particles in an asymmetric channel
• Self-similar inhomogeneous stationary states under constrained dynamics
• Density-Independent transient caging in the high-density phase of motility-induced phase separation
• Hydrodynamics of simple active liquids: the emergence of velocity correlations
• Information conduction and convection in noiseless Vicsek flocks
• Diffusion of gravitactic chiral active Brownian particles in an asymmetric channel
• Active Cahn-Hilliard theory for nonequilibrium phase separation: quantitative macroscopic predictions and a microscopic derivation
• A Rayleigh criterion for mechanical instability: inducing activity by chemo-mechanical coupling
• Beyond the Markovian limit: Exact solutions for active motion in a power-law viscoelastic bath
• Virial stress in systems of active Brownian particles in the presence of translational and rotational inertia
• From Active to Odd to Smart Matter
• Effective Temperature and Einstein Relation for Particles in Mesoscale Turbulence