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DY: Fachverband Dynamik und Statistische Physik

DY 30: Focus Session: New Trends in Nonequilibrium Physics – Conservation Laws and Nonreciprocal Interactions II

DY 30.5: Vortrag

Mittwoch, 20. März 2024, 16:15–16:30, BH-N 243

Two-species Janus colloids with non-reciprocal interactions — •Gennaro Tucci, Suropriya Saha, and Ramin Golestanian — Max Planck Institute for Dynamics and Self-Organization, Göttingen, Germany

We are examining two interacting populations of Janus colloids, each distinguished by their catalytic caps and mobility. The dynamics of these colloids are characterized by their position and orientation, influencing and being influenced by the density distribution of a single chemical substrate. Specifically, the particles can produce or consume the chemical and interact with its concentration gradient through chemotaxis. This chemically-mediated coupling gives rise to an effective non-reciprocal interaction between the two colloid species, resulting in novel configurations of instability. We derive the equation of motion for both density and the polar order parameter through a systematic coarse-graining of the microscopic dynamics. Subsequently, a linear stability analysis of the reference state, featuring constant densities and disordered polarity, allows us to elucidate the mechanisms by which it may become unstable. Initially, we demonstrate how the system exhibits one-species-like behavior in a certain parameter subspace. Finally, we explore phases that can be obtained through the non-reciprocal nature of the two-species interaction.

Keywords: Non-reciprocal interactions; Nonequilibrium physics; Janus colloids