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Colloidal Hard Spheres: Triumphs, Challenges and Mysteries
C. Patrick Royall, Patrick Charbonneau, Marjolein Dijkstra +4
The simplicity of hard spheres as a model system is deceptive. Although the particles interact solely through volume exclusion, that nevertheless suffices for a wealth of static an…
Effective dynamics and fluctuations of a trapped probe moving in a fluid of active hard discs
Ashreya Jayaram, Thomas Speck
We study the dynamics of a single trapped probe surrounded by self-propelled active particles in two dimensions. In the limit of large size separation, we perform an adiabatic elim…
Force generation in confined active fluids: The role of microstructure
Shuvojit Paul, Ashreya Jayaram, N Narinder +2
We experimentally determine the force exerted by a bath of active particles onto a passive probe as a function of its distance to a wall and compare it to the measured averaged den…
Efficiency of isothermal active matter engines: Strong driving beats weak driving
Thomas Speck
We study microscopic engines that use a single active particle as their "working medium". Part of the energy required to drive the directed motion of the particle can be recovered…
Hunting active Brownian particles: Learning optimal behavior
Marcel Gerhard, Ashreya Jayaram, Andreas Fischer +1
We numerically study active Brownian particles that can respond to environmental cues through a small set of actions (switching their motility and turning left or right with respec…
Modeling non-linear dielectric susceptibilities of supercooled molecular liquids
Thomas Speck
Advances in high-precision dielectric spectroscopy has enabled access to non-linear susceptibilities of polar molecular liquids. The observed non-monotonic behavior has been claime…