Liquid-like and gas-like features of a simple fluid: An insight from theory and simulationстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 4 сентября 2018 г.
Аннотация:A soft-sphere system is one of the simplest and most studied models of many-body
problems. In contrast to real substances, it does not have a cohesive state and boiling
line. For this reason, the fluid phase has been considered to be the same everywhere on
the phase diagram with no difference between the gas and liquid phase. Here, we show
that the soft-sphere fluid can in fact be demarcated into two states with liquid-like and
gas-like properties even though these states are not separated by a thermodynamic phase
transition. We find that particle dynamics and excitation spectra are qualitatively different
in the two states. This difference applies to other system properties such as viscosity,
diffusion and speed of sound. We consider different repulsion exponents of the soft-sphere
system as well as the limiting case of the hard-sphere system and comment on their
implications for demarcating the fluid phase into liquid-like and gas-like states