On the relationship between structure and dynamics in a supercooled liquid

by: Asaph Widmer-Cooper, Peter Harrowell

Journal of Physics: Condensed Matter, Vol. 17, No. 49. (2005), pp. S4025-S4034.

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Abstract

We present the dynamic propensity distribution as an explicit measure of the degree to which the dynamics in a liquid over the time scale of structural relaxation is determined by the initial configuration. We then examine, for a binary mixture of soft discs in two dimensions, the correlation between the spatial distribution of propensity and that of two local measures of configuration structure: the local composition and local free volume. While the small particles dominate the high propensity population, we find no strong correlation between either the local composition or the local free volume and the propensity. It is argued that this is a generic failure of purely local structural measures to capture the inherently non-local character of collective behaviour.

@article{citeulike:2386431, abstract = {We present the dynamic propensity distribution as an explicit measure of the degree to which the dynamics in a liquid over the time scale of structural relaxation is determined by the initial configuration. We then examine, for a binary mixture of soft discs in two dimensions, the correlation between the spatial distribution of propensity and that of two local measures of configuration structure: the local composition and local free volume. While the small particles dominate the high propensity population, we find no strong correlation between either the local composition or the local free volume and the propensity. It is argued that this is a generic failure of purely local structural measures to capture the inherently non-local character of collective behaviour.}, author = {Widmer-Cooper, Asaph and Harrowell, Peter }, citeulike-article-id = {2386431}, doi = {10.1088/0953-8984/17/49/001}, journal = {Journal of Physics: Condensed Matter}, keywords = {dyn-het, journal-club, structure}, number = {49}, pages = {S4025--S4034}, posted-at = {2008-02-15 14:48:48}, priority = {0}, title = {On the relationship between structure and dynamics in a supercooled liquid}, url = {http://dx.doi.org/10.1088/0953-8984/17/49/001}, volume = {17}, year = {2005} }

RIS record

TY - JOUR ID - citeulike:2386431 TI - On the relationship between structure and dynamics in a supercooled liquid JF - Journal of Physics: Condensed Matter VL - 17 IS - 49 SP - S4025 EP - S4034 N2 - We present the dynamic propensity distribution as an explicit measure of the degree to which the dynamics in a liquid over the time scale of structural relaxation is determined by the initial configuration. We then examine, for a binary mixture of soft discs in two dimensions, the correlation between the spatial distribution of propensity and that of two local measures of configuration structure: the local composition and local free volume. While the small particles dominate the high propensity population, we find no strong correlation between either the local composition or the local free volume and the propensity. It is argued that this is a generic failure of purely local structural measures to capture the inherently non-local character of collective behaviour. KW - dyn-het KW - journal-club KW - structure AU - Widmer-Cooper, Asaph AU - Harrowell, Peter PY - 2005/// UR - http://dx.doi.org/10.1088/0953-8984/17/49/001 ER -

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