Excitation lines and the breakdown of Stokes-Einstein relations in supercooled liquids Export

@article{citeulike:4509122, abstract = {By applying the concept of dynamical facilitation and analyzing the excitation lines that result from this facilitation; we investigate the origin of decoupling of transport coefficients in supercooled liquids. We illustrate our approach with two classes of models. One depicts diffusion in a strong glass former; and the other in a fragile glass former. At low temperatures; both models exhibit violation of the Stokes-Einstein relation; D ∼τ −1 ; where D is the self-diffusion constant and τ is the structural relaxation time. In the strong case; the violation is sensitive to dimensionality d ; going as D ∼τ −2∕3 for d =1 and as D ∼τ −0.95 for d =3 . In the fragile case; however; we argue that dimensionality dependence is weak; and show that for d =1 ; D ∼τ −0.73 . This scaling for the fragile case compares favorably with the results of a recent experimental study for a three-dimensional fragile glass former.}, author = {Jung, Younjoon and Garrahan, Juan P. and Chandler, David}, citeulike-article-id = {4509122}, citeulike-linkout-0 = {http://dx.doi.org/10.1103/PhysRevE.69.061205}, citeulike-linkout-1 = {http://link.aps.org/abstract/PRE/v69/i6/e061205}, citeulike-linkout-2 = {http://link.aps.org/pdf/PRE/v69/i6/e061205}, doi = {10.1103/PhysRevE.69.061205}, journal = {Physical Review E}, keywords = {diffusion, dynahetero, glass, simulation}, month = {Jun}, number = {6}, pages = {061205+}, posted-at = {2009-05-13 03:33:39}, priority = {2}, publisher = {American Physical Society}, title = {Excitation lines and the breakdown of Stokes-Einstein relations in supercooled liquids}, url = {http://dx.doi.org/10.1103/PhysRevE.69.061205}, volume = {69}, year = {2004} }

TY - JOUR ID - citeulike:4509122 L3 - citeulike-article-id:4509122 N2 - By applying the concept of dynamical facilitation and analyzing the excitation lines that result from this facilitation; we investigate the origin of decoupling of transport coefficients in supercooled liquids. We illustrate our approach with two classes of models. One depicts diffusion in a strong glass former; and the other in a fragile glass former. At low temperatures; both models exhibit violation of the Stokes-Einstein relation; D ∼τ −1 ; where D is the self-diffusion constant and τ is the structural relaxation time. In the strong case; the violation is sensitive to dimensionality d ; going as D ∼τ −2∕3 for d =1 and as D ∼τ −0.95 for d =3 . In the fragile case; however; we argue that dimensionality dependence is weak; and show that for d =1 ; D ∼τ −0.73 . This scaling for the fragile case compares favorably with the results of a recent experimental study for a three-dimensional fragile glass former. IS - 6 JF - Physical Review E TI - Excitation lines and the breakdown of Stokes-Einstein relations in supercooled liquids PB - American Physical Society VL - 69 SP - 061205 KW - diffusion KW - dynahetero KW - glass KW - simulation AU - Jung, Younjoon AU - Garrahan, Juan AU - Chandler, David PY - 2004/Jun// UR - http://dx.doi.org/10.1103/PhysRevE.69.061205 ER -