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Journal Articles Physical Review X Year : 2017

## Fluctuations and shape of cooperative rearranging regions in glass-forming liquids

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Giulio Biroli
Chiara Cammarota

#### Abstract

We develop a theory of amorphous interfaces in glass-forming liquids. We show that the statistical properties of these surfaces, which separate regions characterized by different amorphous arrangements of particles, coincide with the ones of domain walls in the random field Ising model. A major consequence of our results is that super-cooled liquids are characterized by two different static lengths: the point-to-set $\xi_{PS}$ which is a measure of the spatial extent of cooperative rearranging regions and the wandering length $\xi_\perp$ which is related to the fluctuations of their shape. We find that $\xi_\perp$ grows when approaching the glass transition but slower than $\xi_{PS}$. The wandering length increases as $s_c^{-1/2}$, where $s_c$ is the configurational entropy. Our results strengthen the relationship with the random field Ising model found in recent works. They are in agreement with previous numerical studies of amorphous interfaces and provide a theoretical framework for explaining numerical and experimental findings on pinned particle systems and static lengths in glass-forming liquids.

### Dates and versions

cea-01188539 , version 1 (31-08-2015)

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• HAL Id : cea-01188539 , version 1
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### Cite

Giulio Biroli, Chiara Cammarota. Fluctuations and shape of cooperative rearranging regions in glass-forming liquids. Physical Review X, 2017, 7, pp.011011. ⟨10.1103/PhysRevX.7.011011⟩. ⟨cea-01188539⟩

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