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arXiv 0904.4922cond-mat.soft
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液态图中的“同构”

"Isomorphs" in liquid state diagrams

Nicoletta Gnan, Thomas B. Schrøder, Ulf R. Pedersen, Nicholas P. Bailey, Jeppe C. Dyre

摘要:

如果液体在NVT系综中的维里和势能热平衡波动超过90%相关,则该液体被称为强相关[Phys. Rev. Lett. 100,015701(2008)]。强关联液体的波动很好地近似的逆幂律分子间势。基于这一事实,我们在这里定义“同构线”的状态图中的强关联液体。它是从计算机模拟的Kob-Andersen二进制Lennard-Jones液体,没有老化与两个同构点之间的跳跃。同构状态点具有相同的过剩熵、相同的约化平均弛豫时间、相同的(约化)动力学和相同的标度径向分布函数。最后,我们计算了伦纳德-琼斯型液体的维里/势能图中的同构方程,并表明所有此类12-6液体都具有相同的同构;这些可以缩放为主同构。

英文摘要:

A liquid is termed strongly correlating if its virial and potential energy thermal equilibrium fluctuations in the NVT ensemble are more than 90% correlated [Phys. Rev. Lett. 100, 015701 (2008)]. The fluctuations of a strongly correlating liquid are well approximated by those of an inverse power-law intermolecular potential. Building on this fact we here define "isomorphic lines" in the state diagram of a strongly correlating liquid. It is shown from computer simulations of the Kob-Andersen binary Lennard-Jones liquid that no aging is associated with jumps between two isomorphic points. Isomorphic state points have the same excess entropy, the same reduced average relaxation time, the same (reduced) dynamics, and the same scaled radial distribution functions. Finally we calculate the equation for isomorphs in the virial / potential energy diagram for Lennard-Jones type liquids and show that all such 12-6 liquids have the same isomorphs; these may be scaled into a master isomorph.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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