Crossover from normal to anomalous diffusion in field-aligned dipolar systems
Using molecular dynamics simulations we investigate the translational dynamics of particles with dipolar interactions in homogenous external fields. For a broad range of concentrations, we find that the anisotropic, yet normal diffusive behavior characterizing weakly coupled systems becomes anomalou...
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| Veröffentlicht in: | arXiv.org 2010-09 |
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| creator | Jordanovic, Jelena Klapp, Sabine H L |
| description | Using molecular dynamics simulations we investigate the translational dynamics of particles with dipolar interactions in homogenous external fields. For a broad range of concentrations, we find that the anisotropic, yet normal diffusive behavior characterizing weakly coupled systems becomes anomalous both parallel and perpendicular to the field at sufficiently high dipolar coupling and field strength. After the ballistic regime, chain formation first yields cage-like motion in all directions, followed by transient, mixed diffusive-superdiffusive behavior resulting from cooperative motion of the chains. The enhanced dynamics disappears only at higher densities close to crystallization. |
| doi_str_mv | 10.48550/arxiv.1006.0683 |
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| subjects | Chains Coupling (molecular) Crossovers Crystallization Dipole interactions Field strength Molecular dynamics Physics - Soft Condensed Matter |
| title | Crossover from normal to anomalous diffusion in field-aligned dipolar systems |
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