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Journal Articles Physical Review Letters Year : 2019

Active glass: ergodicity breaking dramatically affects response to self-propulsion

Abstract

We study experimentally the response of a dense sediment of Brownian particles to self-propulsion. We observe that the ergodic supercooled liquid relaxation is monotonically enhanced by activity. By contrast the nonergodic glass shows an order of magnitude slowdown at low activities with respect to passive case, followed by fluidization at higher activities. Our results contrast with theoretical predictions of the ergodic approach to glass transition summing up to a shift of the glass line. We propose that nonmonotonicity is due to competing effects of activity: (i) extra energy that helps breaking cages (ii) directionality that hinders cage exploration. We call it "Deadlock from the Emergence of Active Directionality" (DEAD). It suggests further theoretical works should include thermal motion.
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Dates and versions

hal-02309731 , version 1 (09-10-2019)

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Natsuda Klongvessa, Félix Ginot, Christophe Ybert, Cécile Cottin-Bizonne, Mathieu Leocmach. Active glass: ergodicity breaking dramatically affects response to self-propulsion. Physical Review Letters, 2019, 123 (24), pp.248004. ⟨10.1103/PhysRevLett.123.248004⟩. ⟨hal-02309731⟩
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