Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session Y48: Active Matter II
11:15 AM–2:03 PM,
Friday, March 9, 2018
LACC Room: 510
Sponsoring Units: GSNP DFD
Chair: Igor Aronson, Biomedical Engineering, Pennsylvania State University
Abstract: Y48.00010 : Spin Lattices of Macroscopic Wave-driven Particles*
1:03 PM–1:15 PM
(Engineering, Brown University)
We present experiments that demonstrate the spontaneous emergence of collective behavior in spin lattices of droplets walking on a vibrating fluid surface. Circular wells at the bottom of the fluid bath encourage individual droplets to walk in clockwise or counter-clockwise direction along circular trajectories centered at the lattice sites. A thin fluid layer between the wells enables wave-mediated interactions between neighboring walkers resulting in coherent rotation dynamics across the lattice. When the pair-coupling is sufficiently strong, interactions between neighboring droplets may induce local spin flips leading to ferromagnetic or anti-ferromagnetic order. Our results for different 1D and 2D lattice symmetries illustrate the effects of topological frustration.
*This work was supported by the US National Science Foundation through grants CMMI-1333242, DMS-1614043 and CMMI-1727565.
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