article · 26/12/2013
Geometry-Induced Superdiffusion in Driven Crowded Systems
Résumé
Recent molecular dynamics simulations of glass-forming liquids revealed superdiffusive fluctuations associated with the position of a tracer particle (TP) driven by an external force. Such an anomalous response, whose mechanism remains elusive, has been observed up to now only in systems close to their glass transition, suggesting that this could be one of its hallmarks. Here, we show that the presence of superdiffusion is in actual fact much more general, provided that the system is crowded and geometrically confined. We present and solve analytically a minimal model consisting of a driven TP in a dense, crowded medium in which the motion of particles is mediated by the diffusion of packing defects, called vacancies. For such nonglass-forming systems, our analysis predicts a long-lived superdiffusion which ultimately crosses over to giant diffusive behavior. We find that this trait is present in confined geometries, for example long capillaries and stripes, and emerges as a universal response of crowded environments to an external force. These findings are confirmed by numerical simulations of systems as varied as lattice gases, dense liquids, and granular fluids.
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Benichou, O., Bodrova, A., Chakraborty, D., Illien, P., Law, A., Mejia-Monasterio, C., Oshanin, G., & Voituriez, R. (2013). Geometry-Induced Superdiffusion in Driven Crowded Systems. PHYSICAL REVIEW LETTERS, 111(26). https://doi.org/10.1103/PhysRevLett.111.260601@article{Benichou2013_227,
author = {Benichou, Olivier and Bodrova, Anna and Chakraborty, Dipanjan and Illien, Pierre and Law, Adam and Mejia-Monasterio, Carlos and Oshanin, Gleb and Voituriez, Raphael},
year = {2013},
month = {12},
title = {Geometry-Induced Superdiffusion in Driven Crowded Systems},
journal = {PHYSICAL REVIEW LETTERS},
volume = {111},
number = {26},
abstract = {Recent molecular dynamics simulations of glass-forming liquids revealed superdiffusive fluctuations associated with the position of a tracer particle (TP) driven by an external force. Such an anomalous response, whose mechanism remains elusive, has been observed up to now only in systems close to their glass transition, suggesting that this could be one of its hallmarks. Here, we show that the presence of superdiffusion is in actual fact much more general, provided that the system is crowded and geometrically confined. We present and solve analytically a minimal model consisting of a driven TP in a dense, crowded medium in which the motion of particles is mediated by the diffusion of packing defects, called vacancies. For such nonglass-forming systems, our analysis predicts a long-lived superdiffusion which ultimately crosses over to giant diffusive behavior. We find that this trait is present in confined geometries, for example long capillaries and stripes, and emerges as a universal response of crowded environments to an external force. These findings are confirmed by numerical simulations of systems as varied as lattice gases, dense liquids, and granular fluids.},
url = {http://www.dx.doi.org/10.1103/PhysRevLett.111.260601},
doi = {10.1103/PhysRevLett.111.260601},
issn = {0031-9007},
}TY - JOUR
AU - Benichou, Olivier
AU - Bodrova, Anna
AU - Chakraborty, Dipanjan
AU - Illien, Pierre
AU - Law, Adam
AU - Mejia-Monasterio, Carlos
AU - Oshanin, Gleb
AU - Voituriez, Raphael
PY - 2013
DA - 2013/12/26
TI - Geometry-Induced Superdiffusion in Driven Crowded Systems
JO - PHYSICAL REVIEW LETTERS
VL - 111
IS - 26
SN - 0031-9007
AB - Recent molecular dynamics simulations of glass-forming liquids revealed superdiffusive fluctuations associated with the position of a tracer particle (TP) driven by an external force. Such an anomalous response, whose mechanism remains elusive, has been observed up to now only in systems close to their glass transition, suggesting that this could be one of its hallmarks. Here, we show that the presence of superdiffusion is in actual fact much more general, provided that the system is crowded and geometrically confined. We present and solve analytically a minimal model consisting of a driven TP in a dense, crowded medium in which the motion of particles is mediated by the diffusion of packing defects, called vacancies. For such nonglass-forming systems, our analysis predicts a long-lived superdiffusion which ultimately crosses over to giant diffusive behavior. We find that this trait is present in confined geometries, for example long capillaries and stripes, and emerges as a universal response of crowded environments to an external force. These findings are confirmed by numerical simulations of systems as varied as lattice gases, dense liquids, and granular fluids.
DO - 10.1103/PhysRevLett.111.260601
UR - http://www.dx.doi.org/10.1103/PhysRevLett.111.260601
ER -