Marginal Stability Enables Memory Training in Jammed Solids

Abstract

Memory encoding by cyclic shear is a reliable process to store information in jammed solids, yet its underlying mechanism and its connection to the amorphous structure are not fully understood. When a jammed sphere packing is repeatedly sheared with cycles of the same strain amplitude, it optimizes its mechanical response to the cyclic driving and stores a memory of it. We study memory by cyclic shear training as a function of the underlying stability of the amorphous structure in marginally stable and highly stable packings, the latter produced by minimizing the potential energy using both positional and radial degrees of freedom. We find that jammed solids need to be marginally stable in order to store a memory by cyclic shear. In particular, highly stable packings store memories only after overcoming brittle yielding and the cyclic shear training takes place in the shear band, a region which we show to be marginally stable.

arXiv comment5 pages, 4 figures

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Cited by in corpus (7)

• Mechanical memories in solids, from disorder to design
• Mechanical annealing and memories in a disordered solid
• Finite-disorder critical point in the yielding transition of elasto-plastic models
• Ultra-stable shear jammed granular material
• Competition between energy and dynamics in memory formation
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• Yielding and memory in a driven mean-field model of glasses