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Fluctuating Topological Defects in 2D Liquids: Heterogeneous Motion and Noise | | C. Reichhardt
; C.J. Olson Reichhardt
; | | Date: |
14 Sep 2002 | | Journal: | Phys. Rev. Lett. 90, 095504 (2003) | | Subject: | Soft Condensed Matter; Disordered Systems and Neural Networks | cond-mat.soft cond-mat.dis-nn | | Abstract: | We measure the defect density as a function of time at different temperatures in simulations of a two dimensional system of interacting particles. Just above the solid to liquid transition temperature, the power spectrum of the defect fluctuations shows a 1/f signature, which crosses over to a white noise signature at higher temperatures. When 1/f noise is present, the 5-7 defects predominately form string like structures, and the particle trajectories show a 1D correlated motion that follows the defect strings. At higher temperatures this heterogeneous motion is lost. We demonstrate this heterogeneity both in systems interacting with a short ranged screened Coulomb interaction, as well as in systems with a long range logarithmic interaction between the particles. | | Source: | arXiv, cond-mat/0209334 | | Services: | Forum | Review | PDF | Favorites | |
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