ORCID

Joseph D Paulsen: 0000-0001-6048-456X

Document Type

Article

Date

2013

Keywords

cyclic shear, disordered system, memory formation, non-brownian, particle correlations, simple modeling

Language

English

Official Citation

Multiple transient memories in sheared suspensions: Robustness, structure, and routes to plasticity. NC Keim, JD Paulsen, & SR Nagel, Physical Review E 88, 032306 (2013).

Disciplines

Physics

Description/Abstract

Multiple transient memories, originally discovered in charge-density-wave conductors, are a remarkable and initially counterintuitive example of how a system can store information about its driving. In this class of memories, a system can learn multiple driving inputs, nearly all of which are eventually forgotten despite their continual input. If sufficient noise is present, the system regains plasticity so that it can continue to learn new memories indefinitely. Recently, Keim and Nagel [Phys. Rev. Lett. 107, 010603 (2011)] showed how multiple transient memories could be generalized to a generic driven disordered system with noise, giving as an example simulations of a simple model of a sheared non-Brownian suspension. Here, we further explore simulation models of suspensions under cyclic shear, focusing on three main themes: robustness, structure, and overdriving. We show that multiple transient memories are a robust feature independent of many details of the model. The steady-state spatial distribution of the particles is sensitive to the driving algorithm; nonetheless, the memory formation is independent of such a change in particle correlations. Finally, we demonstrate that overdriving provides another means for controlling memory formation and retention.

ISSN

15393755

Additional Information

Additional authors: SR Nagel and N Keim

Physical Review E allows its authors to archive pre-print, post-print, and publisher's versions of publications.

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