Diffusion and Relaxation Dynamics in Cluster Crystals

by: Angel J Moreno, Christos N Likos

Physical Review Letters, Vol. 99, No. 10. (2007)

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Abstract

For a large class of fluids exhibiting ultrasoft bounded pair potentials, particles form crystals consisting of clusters located in the lattice sites, with a density-independent lattice constant. Here we present an investigation on the dynamic features of a representative example of this class. It is found that particles can diffuse between lattice sites, maintaining the lattice structure, through an activated hopping mechanism. This feature yields finite values for the diffusivity and full relaxation of density correlation functions. Simulations suggest the existence of a localization transition which is avoided by hopping and a dynamic decoupling between self- and collective correlations.

@article{citeulike:2552923, abstract = {For a large class of fluids exhibiting ultrasoft bounded pair potentials, particles form crystals consisting of clusters located in the lattice sites, with a density-independent lattice constant. Here we present an investigation on the dynamic features of a representative example of this class. It is found that particles can diffuse between lattice sites, maintaining the lattice structure, through an activated hopping mechanism. This feature yields finite values for the diffusivity and full relaxation of density correlation functions. Simulations suggest the existence of a localization transition which is avoided by hopping and a dynamic decoupling between self- and collective correlations.}, author = {Moreno, Angel J. and Likos, Christos N. }, citeulike-article-id = {2552923}, doi = {10.1103/PhysRevLett.99.107801}, journal = {Physical Review Letters}, keywords = {2007, diffusion, foam}, number = {10}, posted-at = {2008-03-18 20:37:52}, priority = {2}, publisher = {APS}, title = {Diffusion and Relaxation Dynamics in Cluster Crystals}, url = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=PRLTAO000099000010107801000001\&idtype=cvips\&gifs=yes}, volume = {99}, year = {2007} }

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TY - JOUR ID - citeulike:2552923 TI - Diffusion and Relaxation Dynamics in Cluster Crystals JF - Physical Review Letters VL - 99 IS - 10 PB - APS N2 - For a large class of fluids exhibiting ultrasoft bounded pair potentials, particles form crystals consisting of clusters located in the lattice sites, with a density-independent lattice constant. Here we present an investigation on the dynamic features of a representative example of this class. It is found that particles can diffuse between lattice sites, maintaining the lattice structure, through an activated hopping mechanism. This feature yields finite values for the diffusivity and full relaxation of density correlation functions. Simulations suggest the existence of a localization transition which is avoided by hopping and a dynamic decoupling between self- and collective correlations. KW - 2007 KW - diffusion KW - foam AU - Moreno, Angel AU - Likos, Christos PY - 2007/// UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000099000010107801000001&idtype=cvips&gifs=yes ER -

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