Cyclic Memories in Matter– Physics Colloquium Friday Nov. 9, 2018

Cyclic Memories in Matter
Friday, Nov 9, 2018, 2pm in P-148
 
Nathan Keim
Dep. of Physics, San Louis Obispo
 
Cyclic driving occurs all around us. For example, buildings and bridges are repeatedly loaded and unloaded, and temperatures change between day and night. This kind of driving can change a material, but in some cases it also forms memories that can be recalled later. I present two remarkable examples of matter that, when deformed repeatedly, “learns” the magnitudes of those deformations: a suspension of particles in liquid, and a jammed solid made of closely packed particles. Their memories follow different rules, with jammed solids showing a behavior best known in magnetic materials. Against intuition, these materials’ disordered structures, and sometimes even the presence of noise, is essential for the fidelity of their memories.
 
Host: Prof. A. Baljon
 
 
 

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