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Experimental Evidence of the Gardner Phase in a Granular Glass

Analyzing the dynamics of a vibrated bidimensional packing of bidisperse granular disks below jamming, we provide evidence of a Gardner phase deep into the glass phase. To do so, we perform several compression cycles within a given realization of the same glass and show that the particles select dif...

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Published in:Physical review letters 2016-11, Vol.117 (22), p.228001-228001, Article 228001
Main Authors: Seguin, A, Dauchot, O
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Language:English
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description Analyzing the dynamics of a vibrated bidimensional packing of bidisperse granular disks below jamming, we provide evidence of a Gardner phase deep into the glass phase. To do so, we perform several compression cycles within a given realization of the same glass and show that the particles select different average vibrational positions at each cycle, while the neighborhood structure remains unchanged. The separation between the cages obtained for different compression cycles plateaus with an increasing packing fraction, while the mean square displacement steadily decreases. This phenomenology is strikingly similar to that reported in recent numerical observations when entering the Gardner phase, for a mean-field model of glass as well as for hard spheres in finite dimension. We also characterize the distribution of the cage order parameters. Here we note several differences from the numerical results, which could be attributed to activated processes and cage heterogeneities.
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subjects Cages
Compressing
Condensed Matter
Dynamic tests
Glass
Heterogeneity
Mathematical analysis
Mathematical models
Order parameters
Physics
Soft Condensed Matter
title Experimental Evidence of the Gardner Phase in a Granular Glass
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