Memory formation in dense persistent active matter
arxiv(2024)
Abstract
Protocol-dependent states in structural glasses can encode a disordered, yet
retrievable memory. While training such materials is typically done via a
global drive, such as external shear, in dense active matter the driving is
instead local and spatio-temporally correlated. Here we focus on the impact of
such spatial correlation on memory formation. We investigate the mechanical
response of a dense amorphous packing of athermal particles, subject to an
oscillatory quasistatic driving with a tunable spatial correlation, akin to the
instantaneous driving pattern in active matter. We find that the capacity to
encode memory can be rendered comparable upon a proper rescaling on the spatial
correlation, whereas the efficiency in memory formation increases with motion
cooperativity.
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