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arXiv 0903.0516cond-mat.soft
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作为位形空间性质的液体中的强压力-能量相关:温度下降跳跃和结晶的模拟

Strong pressure-energy correlations in liquids as a configuration space property: Simulations of temperature down jumps and crystallization

Thomas B. Schroder, Ulf R. Pedersen, Nicoletta Gnan, Jeppe C. Dyre

摘要:

最近的计算机模拟显示,几种液体在NVT系综中表现出维里和势能平衡波动之间的强相关性[U。R. Pedersen { \it等},物理修订信函{ \bf 100},015701(2008)]。为了研究这些相关性是否也存在远离平衡的恒定体积老化后,温度从平衡跳下,模拟两个强相关的液体,一个不对称哑铃模型和Lewis-Wahnstr{<$}m OTP,以及SPC水是不强相关。对于两种强相关的液体,在老化过程中,维里和势能密切相关。对于SPC水,另一方面,维里和势能变化的相关性很小,因为系统的年龄向平衡。进一步证明强的压力-能量相关性表达了一种构型空间性质,这来自于在恒定温度下过冷Lewis-Wahnstr{<$}m OTP结晶过程中(本文首次报道)对压力和能量的监测。

英文摘要:

Computer simulations recently revealed that several liquids exhibit strong correlations between virial and potential energy equilibrium fluctuations in the NVT ensemble [U. R. Pedersen {\it et al.}, Phys. Rev. Lett. {\bf 100}, 015701 (2008)]. In order to investigate whether these correlations are present also far from equilibrium constant-volume aging following a temperature down jump from equilibrium was simulated for two strongly correlating liquids, an asymmetric dumbbell model and Lewis-Wahnstr{ö}m OTP, as well as for SPC water that is not strongly correlating. For the two strongly correlating liquids virial and potential energy follow each other closely during the aging towards equilibrium. For SPC water, on the other hand, virial and potential energy vary with little correlation as the system ages towards equilibrium. Further proof that strong pressure-energy correlations express a configuration space property comes from monitoring pressure and energy during the crystallization (reported here for the first time) of supercooled Lewis-Wahnstr{ö}m OTP at constant temperature.

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