### 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) |
---|---|

Pages (from-to) | 662-665 |

Number of pages | 4 |

Journal | Physical Review Letters |

Volume | 70 |

Issue number | 5 |

DOIs | |

State | Published - Jan 1 1993 |

### ASJC Scopus subject areas

- Physics and Astronomy(all)

## Fingerprint Dive into the research topics of 'Elastic string in a random potential'. Together they form a unique fingerprint.

## Cite this

Dong, M., Marchetti, M. C., Middleton, A. A., & Vinokur, V. (1993). Elastic string in a random potential.

*Physical Review Letters*,*70*(5), 662-665. https://doi.org/10.1103/PhysRevLett.70.662