Pleimling Michel, Iglói Ferenc
Institut für Theoretische Physik I, Universität Erlangen-Nürnberg, D-91058 Erlangen, Germany.
Phys Rev Lett. 2004 Apr 9;92(14):145701. doi: 10.1103/PhysRevLett.92.145701. Epub 2004 Apr 7.
We study nonequilibrium dynamical properties at a free surface after the system is quenched from the high-temperature phase into the critical point. We show that if the spatial surface correlations decay sufficiently rapidly the surface magnetization and/or the surface manifold autocorrelations have a qualitatively different universal short time behavior than the same quantities in the bulk. At a free surface cluster dissolution may take place instead of domain growth, yielding stationary dynamical correlations that decay in a stretched exponential form. This phenomenon takes place in the three-dimensional Ising model and should be observable in real ferromagnets.
我们研究了系统从高温相猝灭到临界点后自由表面处的非平衡动力学性质。我们表明，如果空间表面关联足够快地衰减，那么表面磁化强度和/或表面流形自关联在定性上具有与体相中相同量不同的普适短时行为。在自由表面处，可能发生团簇溶解而非畴生长，从而产生以拉伸指数形式衰减的稳态动力学关联。这种现象发生在三维伊辛模型中，并且应该在实际铁磁体中可以观测到。
