Short-Time Beta Relaxation in Glass-Forming Liquids Is Cooperative in Nature

Karmakar, Smarajit and Dasgupta, Chandan and Sastry, Srikanth (2016) Short-Time Beta Relaxation in Glass-Forming Liquids Is Cooperative in Nature. In: PHYSICAL REVIEW LETTERS, 116 (8).

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Abstract

Temporal relaxation of density fluctuations in supercooled liquids near the glass transition occurs in multiple steps. Using molecular dynamics simulations for three model glass-forming liquids, we show that the short-time beta relaxation is cooperative in nature. Using finite-size scaling analysis, we extract a growing length scale associated with beta relaxation from the observed dependence of the beta relaxation time on the system size. We find, in qualitative agreement with the prediction of the inhomogeneous mode coupling theory, that the temperature dependence of this length scale is the same as that of the length scale that describes the spatial heterogeneity of local dynamics in the long-time alpha-relaxation regime.

Item Type:	Journal Article
Publication:	PHYSICAL REVIEW LETTERS
Publisher:	AMER PHYSICAL SOC
Additional Information:	Copy right for this article belongs to the AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	02 Apr 2016 07:42
Last Modified:	02 Apr 2016 07:42
URI:	http://eprints.iisc.ac.in/id/eprint/53546

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