The phase diagram and melting scenarios of two-dimensional Hertzian spheresстатья
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Дата последнего поиска статьи во внешних источниках: 25 октября 2018 г.
Аннотация:We present computer simulations of a system of purely repulsive soft colloidal particles interacting
via the Hertz potential and constrained to a two-dimensional plane. This potential describes the elastic interaction of weakly deformable bodies and can be a reliable model for a qualitative description of behaviour of soft macromolecules, such as globular micelles and star polymers. We have found a large number of ordered phases, including dodecagonal quasicrystal, and analysed the melting scenarios of low-density triangle and square phases. It is interesting that depending on the position on the phase diagram, the system can melt both through the first-order transition and in accordance
with the Berezinskii–Kosterlitz–Thouless–Halperin–Nelson–Young scenario (two continuous transitions
with an intermediate hexatic phase) as well as according to recently proposed two-stage melting with the first-order hexatic–isotropic liquid transition and continuous solid–hexatic transition. We have also demonstrated the possibility of a tricritical point on the melting line and have found the line of a water-like density anomaly on the phase diagram.