Do short-time fluctuations predict the long-time dynamic heterogeneity in a supercooled liquid?

@article{citeulike:2881140, abstract = {Recent investigations have demonstrated that the short-time fluctuations in a supercooled liquid can be used as predictors of the long-time dynamic propensity (that is, the regions of the sample with enhanced tendency to be mobile within time scales on the order of the -relaxation time). This could mean that the long-time dynamics (the actual mobility of the particles at such long times) would be implicit in the short-time dynamics or else, that the long-time dynamic propensity [as defined in A. Widmer-Cooper and P. Harrowell, Phys. Rev. Lett. 96, 185701 (2006)], while providing a measure of the degree of jamming of the local structure, would only be sensitive to the short time behavior. The first scenario is in clear disagreement with our recent finding that the influence of the local structure on dynamics (as determined by the propensity for motion) is only local in time, fading out at times close to the metabasin lifetime, much before the -relaxation time. Thus, in this work we show that the short-time fluctuations in supercooled liquids do in fact represent precursors to the dynamics at intermediate times commensurate with the metabasin lifetime (being thus able to predict the regions of the sample that will present high propensity for motion at such stage) but that the dynamical behavior at later times of the relaxation is unpredictable, in agreement with a metabasin random walk scenario.}, author = {Fris, Rodriguez J. A. and Alarc\'on, L. M. and Appignanesi, G. A. }, citeulike-article-id = {2881140}, doi = {10.1103/PhysRevE.76.011502}, journal = {Physical Review E (Statistical, Nonlinear, and Soft Matter Physics)}, keywords = {2007, debate, heterogeneity, pre, supercooled, temperature}, number = {1}, posted-at = {2008-06-11 00:59:18}, priority = {2}, publisher = {APS}, title = {Do short-time fluctuations predict the long-time dynamic heterogeneity in a supercooled liquid?}, url = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=PLEEE8000076000001011502000001\&idtype=cvips\&gifs=yes}, volume = {76}, year = {2007} }

TY - JOUR ID - citeulike:2881140 L3 - citeulike-article-id:2881140 TI - Do short-time fluctuations predict the long-time dynamic heterogeneity in a supercooled liquid? JF - Physical Review E (Statistical, Nonlinear, and Soft Matter Physics) VL - 76 IS - 1 PB - APS N2 - Recent investigations have demonstrated that the short-time fluctuations in a supercooled liquid can be used as predictors of the long-time dynamic propensity (that is, the regions of the sample with enhanced tendency to be mobile within time scales on the order of the -relaxation time). This could mean that the long-time dynamics (the actual mobility of the particles at such long times) would be implicit in the short-time dynamics or else, that the long-time dynamic propensity [as defined in A. Widmer-Cooper and P. Harrowell, Phys. Rev. Lett. 96, 185701 (2006)], while providing a measure of the degree of jamming of the local structure, would only be sensitive to the short time behavior. The first scenario is in clear disagreement with our recent finding that the influence of the local structure on dynamics (as determined by the propensity for motion) is only local in time, fading out at times close to the metabasin lifetime, much before the -relaxation time. Thus, in this work we show that the short-time fluctuations in supercooled liquids do in fact represent precursors to the dynamics at intermediate times commensurate with the metabasin lifetime (being thus able to predict the regions of the sample that will present high propensity for motion at such stage) but that the dynamical behavior at later times of the relaxation is unpredictable, in agreement with a metabasin random walk scenario. KW - 2007 KW - debate KW - heterogeneity KW - pre KW - supercooled KW - temperature AU - Fris, Rodriguez AU - Alarc\'on, LM AU - Appignanesi, GA PY - 2007/// UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PLEEE8000076000001011502000001&idtype=cvips&gifs=yes ER -