Interface Depinning in the Absence of External Driving Force

Details Interface Depinning in the Absence of External Driving Force Interface Depinning in the Absence of External Driving Force

2001-02-22

arxiv.org/abs/cond-mat/0102406v1

Phys. Rev. E 64, 066109 (2001)

Physics

Condensed Matter

4 pages, 3 figures included, uses epsf. Submitted to PRL

Scientific paper

10.1103/PhysRevE.64.066109

We study the pinning-depinning phase transition of interfaces in the quenched Kardar-Parisi-Zhang model as the external driving force $F$ goes towards zero. For a fixed value of the driving force we induce depinning by increasing the nonlinear term coefficient $\lambda$, which is related to lateral growth, up to a critical threshold. We focus on the case in which there is no external force applied (F=0) and find that, contrary to a simple scaling prediction, there is a finite value of $\lambda$ that makes the interface to become depinned. The critical exponents at the transition are consistent with directed percolation depinning. Our results are relevant for paper wetting experiments, in which an interface gets moving with no external driving force.

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