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Creep Motion of an Elastic String in a Random Potential

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Published in Physical Review Letters. 2005, vol. 94, no. 4
Abstract 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 μ, and the roughness exponent ζ. Two regimes are identified: when the temperature is larger than the strength of the disorder we find μ≈1/4 and ζ≈2/3, in agreement with the quasi-equilibrium-nucleation picture of creep motion; on the contrary, lowering enough the temperature, the values of μ and ζ increase showing a strong violation of the latter picture.
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KOLTON, Alejandro, ROSSO, Alberto, GIAMARCHI, Thierry. Creep Motion of an Elastic String in a Random Potential. In: Physical Review Letters, 2005, vol. 94, n° 4. https://archive-ouverte.unige.ch/unige:36130

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Deposited on : 2014-04-29

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