Creep motion of an elastic string in a random potential

被引：73

作者：

Kolton, AB ^{[1
]}

Rosso, A ^{[1
]}

Giamarchi, T ^{[1
]}

机构：

[1] Univ Geneva, DPMC, CH-1211 Geneva 4, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 04期

关键词：

D O I：

10.1103/PhysRevLett.94.047002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the creep motion of an elastic string in a two-dimensional pinning landscape by means of Langevin dynamics simulations. We find that the velocity-force characteristics are well described by the creep formula predicted from phenomenological scaling arguments. We analyze the creep exponent mu and the roughness exponent zeta. Two regimes are identified: when the temperature is larger than the strength of the disorder, we find muapproximate to1/4 and zetaapproximate to2/3, in agreement with the quasi-equilibrium-nucleation picture of creep motion; on the contrary, when lowering the temperature enough, the values of mu and zeta increase, showing a strong violation of the latter picture.

引用

页数：4

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[11] NUMERICAL-INTEGRATION OF STOCHASTIC DIFFERENTIAL-EQUATIONS .2. [J].