Clemens Bechinger
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View article: Tunable colloidal swarmalators with hydrodynamic coupling
Tunable colloidal swarmalators with hydrodynamic coupling Open
Swarmalators - entities that combine swarming with synchronization - offer a powerful framework for understanding systems where spatial organization and internal degrees of freedom are bidirectionally coupled. Such interplay arises in dive…
View article: Equilibrium trajectories quantify second-order violations of the fluctuation–dissipation theorem without the need for a model
Equilibrium trajectories quantify second-order violations of the fluctuation–dissipation theorem without the need for a model Open
Quantifying and characterizing fluctuations far away from equilibrium is a challenging task. We discuss and experimentally confirm a series expansion for a driven classical system, relating the different nonequilibrium cumulants of the obs…
View article: Optimal transitions between nonequilibrium steady states
Optimal transitions between nonequilibrium steady states Open
The optimal control of finite-time processes on the microscale is of significant theoretical and practical interest, particularly for the energy-efficient operation of nanomachines. While previous studies have primarily focused on transiti…
View article: Negative Drag Force on Beating Flagellar-Shaped Bodies in Active Fluids
Negative Drag Force on Beating Flagellar-Shaped Bodies in Active Fluids Open
We experimentally investigate the drag force exerted by a suspension of light-induced active particles (APs) on a translating and beating idealized flagellum-shaped object realized through negative phototactic interactions with the APs. We…
View article: Negative drag force on beating flagellar-shaped bodies in active fluids
Negative drag force on beating flagellar-shaped bodies in active fluids Open
We experimentally investigate the drag force exerted by a suspension of light-induced active particles (APs) on a translating and beating idealized flagellum-shaped object realized through negative phototactic interactions with the APs. We…
View article: Tunable colloidal swarmalators with hydrodynamic coupling
Tunable colloidal swarmalators with hydrodynamic coupling Open
Swarmalators - entities that combine swarming with synchronization - offer a powerful framework for understanding systems where spatial organization and internal degrees of freedom are bidirectionally coupled. Such interplay arises in dive…
View article: Observation and control of nonmonotonic recoils in a viscoelastic fluid
Observation and control of nonmonotonic recoils in a viscoelastic fluid Open
We experimentally study the relaxation dynamics of a colloidal particle in a micellar viscoelastic fluid following different driving protocols. When the particle is driven at constant velocity for a finite duration, its recovery to equilib…
View article: Equilibrium trajectories quantify second order violation of fluctuation dissipation theorem without need of a model
Equilibrium trajectories quantify second order violation of fluctuation dissipation theorem without need of a model Open
Quantifying and characterizing fluctuations far away from equilibrium is a challenging task. We discuss and experimentally confirm a series expansion for a driven classical system, relating the different non-equilibrium cumulants of the ob…
View article: The 2025 motile active matter roadmap
The 2025 motile active matter roadmap Open
Activity and autonomous motion are fundamental aspects of many living and engineering systems. Here, the scale of biological agents covers a wide range, from nanomotors, cytoskeleton, and cells, to insects, fish, birds, and people. Inspire…
View article: The 2024 Motile Active Matter Roadmap
The 2024 Motile Active Matter Roadmap Open
Activity and autonomous motion are fundamental aspects of many living and engineering systems. Here, the scale of biological agents covers a wide range, from nanomotors, cytoskeleton, and cells, to insects, fish, birds, and people. Inspire…
View article: Energy Recuperation of Driven Colloids in Non-Equilibrium Baths
Energy Recuperation of Driven Colloids in Non-Equilibrium Baths Open
When objects move within a classical fluid, this leads to viscous friction, which is irreversibly converted into heat. In particular, at microscopic length scales, such energy loss is detrimental to applications making use of externally an…
View article: Counterfactual rewards promote collective transport using individually controlled swarm microrobots
Counterfactual rewards promote collective transport using individually controlled swarm microrobots Open
Swarm robots offer fascinating opportunities to perform complex tasks beyond the capabilities of individual machines. Just as a swarm of ants collectively moves a large object, similar functions can emerge within a group of robots through …
View article: Universal Symmetry of Optimal Control at the Microscale
Universal Symmetry of Optimal Control at the Microscale Open
Optimizing the energy efficiency of driving processes provides valuable insights into the underlying physics and is of crucial importance for numerous applications, from biological processes to the design of machines and robots. Knowledge …
View article: Average negative heat in a non-Markovian bath
Average negative heat in a non-Markovian bath Open
We experimentally study the motion of a colloidal particle, translated back and forth within a viscoelastic, i.e. non-Markovian bath. The particle starts in equilibrium before the forward motion, but only partially relaxes at the turning p…
View article: Universal symmetry of optimal control at the microscale
Universal symmetry of optimal control at the microscale Open
Optimizing the energy efficiency of driving processes provides valuable insights into the underlying physics and is of crucial importance for numerous applications, from biological processes to the design of machines and robots. Knowledge …
View article: Motility-induced clustering of active particles under soft confinement
Motility-induced clustering of active particles under soft confinement Open
We investigate the structural and dynamic properties of active Brownian particles (APs) confined within a soft annulus-shaped channel. Depending on the strength of the confinement and the Péclet number, we observe a novel re-entrant behavi…
View article: Memory-induced alignment of colloidal dumbbells
Memory-induced alignment of colloidal dumbbells Open
When a colloidal probe is forced through a viscoelastic fluid which is characterized by a long stress-relaxation time, the fluid is excited out of equilibrium. This is leading to a number of interesting effects including a non-trivial reco…
View article: Memory-induced Magnus effect
Memory-induced Magnus effect Open
Spinning objects moving through air or a liquid experience a lift force—a phenomenon known as the Magnus effect. This effect is commonly exploited in ball sports but also is of considerable importance for applications in the aviation indus…
View article: Memory-induced alignment of colloidal dumbbells
Memory-induced alignment of colloidal dumbbells Open
When a colloidal probe is forced through a viscoelastic fluid which is characterized by a long stress-relaxation time, the fluid is excited out of equilibrium. This is leading to a number of interesting effects including a non-trivial reco…
View article: Memory-induced alignment of colloidal dumbbells
Memory-induced alignment of colloidal dumbbells Open
When a colloidal probe is forced through a viscoelastic fluid which is characterized by a long stress-relaxation time, the fluid is excited out of equilibrium. This is leading to a number of interesting effects including a non-trivial reco…
View article: Environmental effects on emergent strategy in micro-scale multi-agent reinforcement learning
Environmental effects on emergent strategy in micro-scale multi-agent reinforcement learning Open
Multi-Agent Reinforcement Learning (MARL) is a promising candidate for realizing efficient control of microscopic particles, of which micro-robots are a subset. However, the microscopic particles' environment presents unique challenges, su…
View article: Memory induced Magnus effect
Memory induced Magnus effect Open
Spinning objects which move through air or liquids experience a Magnus force. This effect is commonly exploited in ball sports but also of considerable importance for applications and fundamental science. Opposed to large objects where Mag…
View article: Self-folding soft-robotic chains with reconfigurable shapes and functionalities
Self-folding soft-robotic chains with reconfigurable shapes and functionalities Open
Magnetic continuum soft robots can actively steer their tip under an external magnetic field, enabling them to effectively navigate in complex in vivo environments and perform minimally invasive interventions. However, the geometries and f…
View article: Dynamics and risk sharing in groups of selfish individuals
Dynamics and risk sharing in groups of selfish individuals Open
Understanding why animals organize in collective states is a central question of current research in, e.g., biology, physics, and psychology. More than 50 years ago, W.D. Hamilton postulated that the formation of animal herds may simply re…
View article: How are mobility and friction related in viscoelastic fluids?
How are mobility and friction related in viscoelastic fluids? Open
The motion of a colloidal probe in a viscoelastic fluid is described by friction or mobility, depending on whether the probe is moving with a velocity or feeling a force. While the Einstein relation describes an inverse relationship valid …
View article: Recoil experiments determine the eigenmodes of viscoelastic fluids
Recoil experiments determine the eigenmodes of viscoelastic fluids Open
We experimentally investigate the transient recoil dynamics of a colloidal probe particle in a viscoelastic fluid after the driving force acting on the probe is suddenly removed. The corresponding recoil displays two distinct timescales wh…