Colloids under time-delayed feedback: single-particle dynamics, collective motion, and relations to active matter
Colloids under time-delayed feedback: single-particle dynamics, collective motion, and relations to active matter
- Event time: 3:00pm until 4:00pm
- Event date: 31st January 2023
- Speaker: Prof. Dr. Sabine Klapp (Technische Universität Berlin)
- Location: Zoom - see email invite.
Event details
Within the last years, feedback (closed-loop) control of fluctuating systems, such as colloids in a thermal bath, has become a focus of growing interest. In this talk I will discuss recent results for colloids under repulsive, nonlinear feedback with time delay, yielding a non-Markovian stochastic system. Starting with the dynamics of single particles I will first discuss the emergence of a steady state characterized by persistent motion. I will then turn to simulation results for the collective behavior of many particles interacting via a repulsive (WCA) potential, each being subject to time-delayed repulsive feedback. Intriguingly, one observes a state with spontaneous, large scale alignment of the velocity vectors. We discuss this delay-induced phenomenon in the light of recent results for active particles.
Event resources
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