Explaining why simple liquids are quasi-universal

Andreas K. Bacher, Thomas B. Schrøder and Jeppe C. Dyre ()
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Andreas K. Bacher: DNRF Center ‘Glass and Time’, IMFUFA, Roskilde University
Thomas B. Schrøder: DNRF Center ‘Glass and Time’, IMFUFA, Roskilde University
Jeppe C. Dyre: DNRF Center ‘Glass and Time’, IMFUFA, Roskilde University

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: Abstract It has been known for a long time that many simple liquids have surprisingly similar structure as quantified, for example, by the radial distribution function. A much more recent realization is that the dynamics are also very similar for a number of systems with quite different pair potentials. Systems with such non-trivial similarities are generally referred to as ‘quasi-universal’. From the fact that the exponentially repulsive pair potential has strong virial potential-energy correlations in the low-temperature part of its thermodynamic phase diagram, we here show that a liquid is quasi-universal if its pair potential can be written approximately as a sum of exponential terms with numerically large prefactors. Based on evidence from the literature we moreover conjecture the converse, that is, that quasi-universality only applies for systems with this property.

Date: 2014
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DOI: 10.1038/ncomms6424

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