Colloids under time-delayed feedback: single-particle dynamics, collective motion, and relations to active matter

Statistical Physics and Complexity Group meeting

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: (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.