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Inferring interactions between active particles using harmonic traps
Arnaud Compagnie, Joscha Mecke, Ivo Buttinoni +1
Quantifying the interactions between active Janus particles remains a challenge that needs to be addressed to describe their collective behaviour. Inspired by a photonic force micr…
Active embracement enables autonomous tweezing in active star polymers
Marco Musacchio, Davide Breoni, Iman Abdoli +3
The capacity for autonomous structural reconfiguration is a defining trait of living systems, yet it remains elusive in artificial active matter. Here, we report the discovery of a…
Jerky Motion of Active Granular Particles
Alexander P. Antonov, Marco Musacchio, Hartmut Löwen +1
Abrupt transitions between rest and motion can render the standard Newtonian description -- based on position, velocity, and acceleration -- incomplete, requiring higher-order deri…
Tilt control of coverage heterogeneity for hard spherocylinders locked on a sphere
Jonathan Washburn, Hartmut Löwen, Elshad Allahyarov
We study hard spherocylinders on a sphere with axes rigidly locked to a tangential director field at fixed angle $\tilt$ to the meridian, necessarily singular at the poles. Three l…
Magnetic active matter across scales
Francisca Guzmán-Lastra, Margaret Rosenberg, Marco Musacchio +2
Magnetic interactions provide a versatile and powerful tool for controlling and organizing active matter, where individual units continuously consume energy to drive autonomous mot…
Transport Properties of Active Particles Moving on Adjustable Networks
William G. C. Oropesa, P. de Castro, Hartmut Löwen +1
Active adaptive matter has attracted considerable interest due to its rich, largely unexplained dynamics and its relevance to a wide range of synthetic and biological materials. An…
Active particles in tunable compressible environments
Venkata Manikantha Sai Ganesh Tanuku, Isha Malhotra, Lorenzo Caprini +3
Active particles affect their environment as much as the environment affects their active motion. Here, we present an experimental system where both can be simultaneously adjusted…
Cybloids Creation and Control of Cybernetic Colloids
Debasish Saha, Sonja Tarama, Hartmut Löwen +1
Colloids play an important role in fundamental science as well as in nature and technology. They have had a strong impact on the fundamental understanding of statistical physics. F…
How to define temperature in active systems?
Lukas Hecht, Lorenzo Caprini, Hartmut Löwen +1
We are used to measure temperature with a thermometer and we know from everyday life that different types of thermometers measure the same temperature. This experience can be based…
Double Mpemba effect in the cooling of trapped colloids
Isha Malhotra, Hartmut Löwen
The Mpemba effect describes the phenomenon that a system at a hot initial temperature cools faster than at an initial warm temperature in the same environment. Such an anomalous co…
Dynamical clustering and wetting phenomena in inertial active matter
Lorenzo Caprini, Davide Breoni, Anton Ldov +2
Dynamical clustering represents a characteristic feature of active matter consisting of self-propelled agents that convert energy from the environment into mechanical motion. At th…
Controlling Colloidal Flow through a Microfluidic Y-junction
Alexander P. Antonov, Matthew Terkel, Fabian Jan Schwarzendahl +3
Microscopic particles flowing through narrow channels may accumulate near bifurcation points provoking flow reduction, clogging and ultimately chip breakage. Here we show that the…
Accessing the Free Expansion of a Crystalline Colloidal Drop by Optical Experiments
Marcus Witt, G. H. Philipp Nguyen, Josefine R. von Puttkamer-Luerssen +8
We study poly-crystalline spherical drops of an aqueous suspension of highly charged colloidal spheres exposed to a colloid-free aqueous environment. Crystal contours were obtained…
Inertial active matter with Coulomb friction
Alexander P. Antonov, Lorenzo Caprini, Anton Ldov +2
Friction is central to the motion of active (self-propelled) objects such as bacteria, animals, and robots. While in a viscous fluid friction is described by Stokes's law, objects…
Active smectics on a sphere
Michael Nestler, Simon Praetorius, Zhi-Feng Huang +2
The dynamics of active smectic liquid crystals confined on a spherical surface is explored through an active phase field crystal model. Starting from an initially randomly perturbe…
Patchy landscapes promote stability of small groups
Gianni Jacucci, Davide Breoni, Sandrine Heijnen +5
Group formation and coordination are fundamental characteristics of living systems, essential for performing tasks and ensuring survival. Interactions between individuals play a ke…
Inertial self-propelled particles in anisotropic environments
Alexander R. Sprenger, Christian Scholz, Anton Ldov +2
Self-propelled particles in anisotropic environments can exhibit a motility that depends on their orientation. This dependence is relevant for a plethora of living organisms but di…
Chiral active matter in external potentials
Lorenzo Caprini, Hartmut Löwen, Umberto Marini Bettolo Marconi
We investigate the interplay between chirality and confinement induced by the presence of an external potential. For potentials having radial symmetry, the circular character of th…
Optimal active particle navigation meets machine learning
Mahdi Nasiri, Hartmut Löwen, Benno Liebchen
The question of how "smart" active agents, like insects, microorganisms, or future colloidal robots need to steer to optimally reach or discover a target, such as an odor source, f…
Statistics of carrier-cargo complexes
René Wittmann, Paul A. Monderkamp, Hartmut Löwen
We explore the statistics of assembling soft-matter building blocks to investigate the uptake and encapsulation of cargo particles by carriers engulfing their load. While the such…
Colloidal smectics in button-like confinements: experiment and theory
René Wittmann, Paul A. Monderkamp, Jingmin Xia +5
Liquid crystals can self-organize into a layered smectic phase. While the smectic layers are typically straight forming a lamellar pattern in bulk, external confinement may drastic…
Motility-induced shear thickening in dense colloidal suspensions
A. Gülce Bayram, Fabian Jan Schwarzendahl, Hartmut Löwen +1
Phase transitions and collective dynamics of active colloidal suspensions are fascinating topics in soft matter physics, particularly for out-of-equilibrium systems, which can lead…
Dynamics of active particles with translational and rotational inertia
Alexander R. Sprenger, Lorenzo Caprini, Hartmut Löwen +1
Inertial effects affecting both the translational and rotational dynamics are inherent to a broad range of active systems at the macroscopic scale. Thus, there is a pivotal need fo…
Network topology of interlocked chiral particles
Paul A. Monderkamp, Rika S. Windisch, René Wittmann +1
Self-assembly of chiral particles with an L-shape is explored by Monte-Carlo computer simulations in two spatial dimensions. For sufficiently high packing densities in confinement,…