Melting Scenario of the Two-Dimensional Core-Softened System: First-Order or Continuous Transition?

25th IUPAP Conference on Computational Physics

物理学;计算机科学

Dudalov, D.E.^1 ; Fomin, Yu.D.^1 ; Tsiok, E.N.^1 ; Ryzhov, V.N.^1

Institute for High Pressure Physics RAS, Kaluzhskoe shosse, 14, 142190, Troitsk, Moscow, Russia^1

关键词: Charge-stabilized colloids;    Continuous transitions;    Core-softened potentials;    First order transitions;    Hydrophobic plates;    Kosterlitz-Thouless;    Melting transitions;    Two-stage transition;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/510/1/012016/pdf
DOI  :  10.1088/1742-6596/510/1/012016

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

We present a computer simulation study of the phase behavior of two-dimensional classical particles repelling each other through an isotropic core-softened potential. As in the analogous three dimensional case, a reentrant-melting transition occurs upon compression for not too high pressures. However, in two dimensions in the low density part of the phase diagram melting is a continuous two-stage transition, with an intermediate hexatic phase. All available evidence supports the Kosterlitz-Thouless-Halperin-Nelson-Young (KTHNY) scenario for this melting transition. On the other hand, at high density part of the phase diagram one first-order transition takes place. We expect that such a phenomenology can be checked in confined monolayers of charge-stabilized colloids with a softened core and water confined between two hydrophobic plates.