Abstract
We have studied numerically the dynamics of a directed elastic string in a two-dimensional array of quenched random impurities. The string is driven by a constant transverse force and thermal fluctuations are neglected. There is a transition from pinned to unpinned behavior at a critical value FT of the driving force. At the transition the average string velocity scales with the driving force. The scaling is equally well described by a power law vd∼(F-FT)ζ, with ζ=0.24±0.1, or by a logarithm, vd∼1/ln(F-FT). The divergence of the velocity-velocity correlation length at threshold is characterized by an exponent ν=1.05±0.1.
Original language | English (US) |
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Pages (from-to) | 662-665 |
Number of pages | 4 |
Journal | Physical Review Letters |
Volume | 70 |
Issue number | 5 |
DOIs | |
State | Published - 1993 |
ASJC Scopus subject areas
- General Physics and Astronomy