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DY: Fachverband Dynamik und Statistische Physik

DY 15: Active Matter II (joint session BP/CPP/DY)

DY 15.8: Vortrag

Dienstag, 19. März 2024, 11:30–11:45, H 1028

Chiral active molecules in traveling activity waves — •Bhavesh Valecha¹ and Abhinav Sharma^1,2 — ¹Institute of Physics, University of Augsburg, 86159 Augsburg, Germany — ²Leibniz-Institut für Polymerforschung Dresden, Institut Theorie der Polymere, 01069 Dresden, Germany

Directed motion is crucial for the survival and maintenance of life-supporting functions of numerous biological systems, e.g., motion of sperms towards the egg during fertilisation or movement of immune cells to fight-off an infection. While systematic studies of chiral active molecules simulating crucial aspects of these systems in stationary activity gradients do exist [1-3], the majority of physical scenarios revolve around activity fields that vary with time. So, in this project we study the simplest possible case of an active molecule, the active dimer, in a propagating activity wave. We show that this simple molecule can show very rich emergent tactic behaviour using a cooperative mechanism between the two active chiral particles. In particular, this dimer can, on average, move along with the wave, against the wave motion or not move at all depending on the magnitude of chiral torque and the wave speed. We believe that this study can provide important insights into the design principles of hybrid bio-molecular devices of the future.

[1] P. L. Muzzeddu, H. D. Vuijk, H. Löwen, J.-U. Sommer, and A. Sharma, J. Chem. Phys. 157, 134902 (2022)

[2] H. D. Vuijk, S. Klempahn, H. Merlitz, J.-U. Sommer, and A. Sharma, Phys. Rev. E 106, 014617 (2022)

[3] H. Merlitz et al., J. Chem. Phys. 148, 194116 (2018)

Keywords: Active Matter; Nonequilibrium Statistical Physics; Physics of Living Systems; Chemotaxis; Chirality