CONICET, Centro Atómico Bariloche, 8400 S. C. de Bariloche, Argentina.
Phys Rev Lett. 2009 Oct 16;103(16):160602. doi: 10.1103/PhysRevLett.103.160602.
We study the nonstationary dynamics of an elastic interface in a disordered medium at the depinning transition. We compute the two-time response and correlation functions, found to be universal and characterized by two independent critical exponents. We find a good agreement between two-loop functional renormalization group calculations and molecular dynamics simulations for the scaling forms, and for the response aging exponent theta_{R}. We also describe a dynamical dimensional crossover, observed at long times in the relaxation of a finite system. Our results are relevant for the nonsteady driven dynamics of domain walls in ferromagnetic films and contact lines in wetting.
我们研究了无序介质中弹性界面在去钉扎转变处的非平稳动力学。我们计算了双时间响应和相关函数，发现它们是普适的，并由两个独立的临界指数来描述。我们发现，对于标度形式和响应老化指数θ_R，两圈泛函重整化群计算和分子动力学模拟之间有很好的一致性。我们还描述了在有限系统弛豫过程中长时间观察到的动态维度交叉。我们的结果与铁磁薄膜中畴壁和润湿接触线的非稳态驱动动力学有关。
