Dresden 2026 – scientific programme
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BP: Fachverband Biologische Physik
BP 34: Focus Session: Emergent Transport in Active Systems (joint session DY/BP)
BP 34.4: Talk
Thursday, March 12, 2026, 16:15–16:30, ZEU/0160
Fluctuation-induced transition in transport of active colloidal cells — •Shashank Ravichandir1,2, Jens-Uwe Sommer1,2, and Abhinav Sharma1,3 — 1Leibniz Institute of Polymer Research, Dresden, Germany — 2Technical University Dresden, Dresden, Germany — 3University of Augsburg, Augsburg, Germany
The transport of active-passive assemblies and their self-localization behavior have been studied in some detail in recent years [1,2]. The "chemotactic" property these exhibit has been attributed to the separation of time scales, i.e between the persistence time of the active particle and the characteristic time scale associated with the interaction between the particles (ex - harmonic springs). We consider a gas of active particles enclosed in a circular vesicle and observe that the transport behavior of the vesicle depends on the density of the enclosed gas or the number of active particles. This is a new mechanism for achieving desired transport of active colloidal cells as no new timescales are introduced by changing the number of active particles. This transition in transport behavior of these vesicles seems to be driven by fluctuations. The proposed model is also experimentally reproducible, contrary to the active-passive assemblies that have been studied so far.
References: [1] H. D. Vuijk et al., Phys. Rev. Lett., 126(20), 2021. [2] P. L. Muzzeddu et al., Phys. Rev. Lett., 133(11), 2024.
Keywords: chemotaxis; colloidal cells; active particles