2026-07-23 ペンシルベニア州立大学（Penn State）
Credit: Jaydyn Isiminger / Penn State. Creative Commons
＜関連情報＞
- https://www.psu.edu/news/eberly-college-science/story/chocolate-syrup-fluid-stores-multiple-interacting-memories
- https://journals.aps.org/prl/abstract/10.1103/ckl2-lcpl
非ブラウン運動的なサスペンションでは、振幅と方向の記憶が共存し、競合する Memories of Amplitude and Direction Coexist and Compete in Non-Brownian Suspensions
Surendra Padamata and Nathan C. Keim
Physical Review Letters Published: 23 June, 2026
DOI: https://doi.org/10.1103/ckl2-lcpl
Abstract
Steadily shearing a non-Brownian suspension forms a memory of direction, while shearing back and forth forms a memory of amplitude. Each memory is evident in the system’s response to further shear, exemplifying its strong history dependence. By combining the steady and oscillatory experiments, we show these memories are distinct but intersecting aspects of the same nonequilibrium physics: they can coexist, yet a specific amplitude suppresses directional memory and makes the system symmetric. Combined with prior results from disordered solids, our Letter presents a simple motif for limited memory capacity in nonequilibrium matter.
