Intermittency, current flows, and short time diffusion in interacting finite sized one-dimensional fluids

Pal, Subrata and Srinivas, Goundla and Bhattacharyya, Sarika and Bagchi, Biman (2002) Intermittency, current flows, and short time diffusion in interacting finite sized one-dimensional fluids. In: Journal of Chemical Physics, 116 (14). pp. 5941-50.

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Abstract

Long time molecular dynamics simulations of one-dimensional Lennard-Jones systems reveal that while the diffusion coefficient of a tagged particle indeed goes to zero in the very long time, the mean-square displacement is linear with time at short to intermediate times, allowing the definition of a short time diffusion coefficient [Lebowitz and Percus, Phys. Rev. 155, 122 (1967)]. The particle trajectories show intermittent displacements, surprisingly similar to the recent experimental results [Wei et al., Science 287, 625 (2000)]. A self-consistent mode coupling theory is presented which can partly explain the rich dynamical behavior of the velocity correlation function and also of the frequency dependent friction. The simulations show a strong dependence of the velocity correlation function on the size of the system, quite unique to one dimensional interacting systems. Inclusion of background noise leads to a dramatic change in the profile of the velocity time correlation function, in agreement with the predictions of Percus [Phys. Rev. A 9, 557 (1974)].

Item Type:	Journal Article
Publication:	Journal of Chemical Physics
Publisher:	American Institute of Physics (AIP)
Additional Information:	The DOI is currently only displayed. Copyright belongs to American Institute of Physics (AIP)
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	09 Jun 2004
Last Modified:	19 Sep 2010 04:12
URI:	http://eprints.iisc.ac.in/id/eprint/220

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