Ising Universality Class for the Liquid-Liquid Critical Point of a One Component Fluid: A Finite-Size Scaling Test
Ising Universality Class for the Liquid-Liquid Critical Point of a One Component Fluid: A Finite-Size Scaling Test
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DOI：
10.1103/physrevlett.109.177801
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发表时间：
2012-10-24
影响因子：
8.6
通讯作者：
Sciortino, Francesco
中科院分区：
文献类型：
--
作者：
Gallo, Paola;Sciortino, Francesco
我们提出了 Jagla 模型中液-液临界点的有限尺寸尺度研究，Jagla 模型是液体的原型模型，具有与液态水相同的热力学异常特征。通过执行连续的伞形采样大正则蒙特卡罗模拟，我们评估了不同系统尺寸的准确状态密度，并确定了与尺寸相关的关键参数。外推到无限大小提供了该模型的总体临界值的估计。有限规模的研究使我们能够确定临界波动与伊辛普适性类别一致，并为贾格拉势中存在液-液临界点提供明确的证据。这一发现支持了在水等异常单组分液体中存在真正的液-液临界点的可能性。
We present a finite-size scaling study of the liquid-liquid critical point in the Jagla model, a prototype model for liquids that present the same thermodynamic anomalies which characterize liquid water. Performing successive umbrella sampling grand canonical Monte Carlo simulations, we evaluate an accurate density of states for different system sizes and determine the size-dependent critical parameters. Extrapolation to infinite size provides estimates of the bulk critical values for this model. The finite-size study allows us to establish that critical fluctuations are consistent with the Ising universality class and to provide definitive evidence for the existence of a liquid-liquid critical point in the Jagla potential. This finding supports the possibility of the existence of a genuine liquid-liquid critical point in anomalous one-component liquids like water.