Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session A09: Active Materials I
8:00 AM–11:00 AM,
Monday, March 6, 2023
Room: Room 132
Sponsoring
Unit:
DSOFT
Chair: Janet Sheung, Scripps College
Abstract: A09.00008 : Optimal control of active nematics in bulk and confined geometries.*
9:24 AM–9:36 AM
Presenter:
SAPTORSHI GHOSH
(Brandeis University)
Author:
SAPTORSHI GHOSH
(Brandeis University)
Collaboration:
Saptorshi Ghosh, Aparna Baskaran, Michael F. Hagan
exhibit diverse local attractors that correspond to distinct dynamical states, many of which exhibit chaotic turbulent-like dynamics. Designing such a system to choose a specific dynamical state to perform a desired function is a formidable challenge. Motivated by recent advances enabling optogenetic control of experimental active materials, we have used optimal control theory to identify spatiotemporal sequences of light-generated activity that direct the dynamics of active matter towards a predetermined steady-state. In this presentation, we will focus on applying this approach to 2D active nematics, which exhibit spontaneous defect proliferation and chaotic streaming dynamics in the absence of control. We find that optimal control theory identifies time-varying active stress fields that guide the system to a variety of dynamical states and functional programs. These include selecting and stabilizing spatiotemporal behaviors that are unstable in the uncontrolled system, and dynamically reconfiguring between dynamical states. Our results lay out a roadmap to leverage optimal control methods to design structure, dynamics, and function in a wide variety of active materials.
*We acknowledge support from Brandeis NSF MRSEC, Bioinspired Soft Materials, DMR-2011846.
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