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arXiv 0811.2673cond-mat.stat-mech
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Spinodal点非平衡态的短时动力学表征

Non-equilibrium Characterization of Spinodal Points using Short Time Dynamics

Ernesto S. Loscar, Ezequiel E. Ferrero, Tomas S. Grigera, Sergio A. Cannas

摘要:

虽然直觉上很吸引人,但旋节线的概念仅在具有无限范围相互作用的系统(平均场系统)中严格定义。在短程系统中,可以通过亚稳测量的外推来定义伪旋节线,但是该点本身是不可到达的,因为它位于亚稳极限之外。在这项工作中,我们表明,一个合理的定义,可以通过短时间内的系统的动力学行为的亚稳相深处,通过寻找一个点,该系统显示出临界行为。结果表明,用这种方法得到的Spinodal点既与平均场系统中的物理Spinodal点一致,又与短程系统中亚平衡行为外推得到的伪Spinodal点一致。有了这个定义,就可以在不考虑平衡问题的情况下进行实际测定。

英文摘要:

Though intuitively appealing, the concept of spinodal is rigourously defined only in systems with infinite range interactions (mean field systems). In short-range systems, a pseudo-spinodal can be defined by extrapolation of metastable measurements, but the point itself is not reachable because it lies beyond the metastability limit. In this work we show that a sensible definition of spinodal points can be obtained through the short time dynamical behavior of the system deep inside the metastable phase, by looking for a point where the system shows critical behavior. We show that spinodal points obtained by this method agree both with the thermodynamical spinodal point in mean field systems and with the pseudo-spinodal point obtained by extrapolation of meta-equilibrium behavior in short range systems. With this definition, a practical determination can be achieved without regard for equilibration issues.

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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