Thermodynamic and structural anomalies of the Gaussian-core model in one dimension

Abstract

We investigated the equilibrium properties of a one-dimensional system of classical particles which interact in pairs through a bounded repulsive potential with a Gaussian shape. Notwithstanding the absence of a proper fluid-solid phase transition, we found that the system exhibits a complex behaviour, with "anomalies" in the density and in the thermodynamic response functions which closely recall those observed in bulk and confined liquid water. We also discuss the emergence in the cold fluid under compression of an unusual structural regime, characterized by density correlations reminiscent of the ordered arrangements found in clustered crystals.

This is an electronic preprint version of an article published in Molecular Physics (Special Issue in Honour of Luciano Reatto), that is available online at http://www.tandfonline.com/doi/abs/10.1080/00268976.2011.628342

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• Hexatic phase in the two-dimensional Gaussian-core model
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• Structure of penetrable-rod fluids: Exact properties and comparison between Monte Carlo simulations and two analytic theories

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