Creep motion of an elastic string in a random potential

Details Creep motion of an elastic string in a random potential Creep motion of an elastic string in a random potential

2004-08-12

arxiv.org/abs/cond-mat/0408284v1

Phys. Rev. Lett. 94, 047002 (2005)

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.94.047002

We study the creep motion of an elastic string in a two dimensional pinning landscape by 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 $\mu \approx 1/4$ and $\zeta \approx 2/3$, in agreement with the quasi-equilibrium-nucleation picture of creep motion; on the contrary, lowering enough the temperature, the values of $\mu$ and $\zeta$ increase showing a strong violation of the latter picture.

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