Seminar - Physics Department

Cyclic Memories in Disordered Matter

Nathan Keim, Pennsylvania State University, Department...

Thursday, February 20, 2020: 11:30am
LGRT 1033

Category: Condensed Matter Seminar

Refreshments at 11:15am

Cyclic driving happens all around us. Buildings and bridges are repeatedly loaded and unloaded, and many organisms synchronize their functions with day and night. This kind of driving can change a material, and even form memories that can be recalled later. I present two examples of materials that, when deformed repeatedly, can "learn" and report the magnitudes of those deformations: a suspension of particles in liquid, and a jammed amorphous solid. These exemplify two different but generic ways that non-equilibrium systems can form memories, with suspensions sharing their behavior with charge-density wave conductors, and amorphous solids approximating the return-point behavior best known in magnetic materials. Memory formation offers a new perspective on these and other systems' non-equilibrium natures, and illuminates the benefits of disorder and noise.

View this event on the Physics Department website