Length scale for the onset of Fickian diffusion in supercooled liquids Export

@article{citeulike:5038654, abstract = {The interplay between self-diffusion and excitation lines in space-time was recently studied in kinetically constrained models to explain the breakdown of the Stokes-Einstein law in supercooled liquids. Here, we further examine this interplay and its manifestation in incoherent scattering functions. In particular, we establish a dynamic length scale below which Fickian diffusion breaks down, as is observed in experiments and simulations. We describe the temperature dependence of this length scale in liquids of various fragilities, and provide analytical estimates for the van Hove and self-intermediate scattering functions.}, author = {Berthier, L. and Chandler, D. and Garrahan, J. P.}, citeulike-article-id = {5038654}, citeulike-linkout-0 = {http://dx.doi.org/10.1209/epl/i2004-10401-5}, doi = {10.1209/epl/i2004-10401-5}, journal = {EPL (Europhysics Letters)}, keywords = {diffusion, glass, simulation, spin}, number = {3}, pages = {320--326}, posted-at = {2009-07-02 03:51:31}, priority = {2}, title = {Length scale for the onset of Fickian diffusion in supercooled liquids}, url = {http://dx.doi.org/10.1209/epl/i2004-10401-5}, volume = {69}, year = {2005} }

TY - JOUR ID - citeulike:5038654 L3 - citeulike-article-id:5038654 N2 - The interplay between self-diffusion and excitation lines in space-time was recently studied in kinetically constrained models to explain the breakdown of the Stokes-Einstein law in supercooled liquids. Here, we further examine this interplay and its manifestation in incoherent scattering functions. In particular, we establish a dynamic length scale below which Fickian diffusion breaks down, as is observed in experiments and simulations. We describe the temperature dependence of this length scale in liquids of various fragilities, and provide analytical estimates for the van Hove and self-intermediate scattering functions. IS - 3 JF - EPL (Europhysics Letters) EP - 326 TI - Length scale for the onset of Fickian diffusion in supercooled liquids VL - 69 SP - 320 KW - diffusion KW - glass KW - simulation KW - spin AU - Berthier, L AU - Chandler, D AU - Garrahan, JP PY - 2005/// UR - http://dx.doi.org/10.1209/epl/i2004-10401-5 ER -