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  • Open Access

Height distribution of elastic interfaces in quenched random media

Tuuli Sillanpää*, Sanni Nousiainen, and Lasse Laurson†

  • Computational Physics Laboratory, Tampere University, P.O. Box 600, FI-33014 Tampere, Finland

  • *Contact author: tuuli.sillanpaa@tuni.fi
  • †Contact author: lasse.laurson@tuni.fi
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Phys. Rev. E 113, 014141 – Published 28 January, 2026

DOI: https://doi.org/10.1103/y4h5-kw3m

Abstract

Elastic interfaces in quenched random media driven by external forces exhibit a continuous depinning phase transition between pinned and moving phases at a critical external force. Recent work [Phys. Rev. Lett. 129, 175701 (2022)] has shown that the distribution of local interface heights at depinning displays negative skewness. Here, by considering local, long-range, and fully coupled (mean-field) elasticity, we expand on this result by demonstrating the robustness of the negative skewness at depinning when approaching the thermodynamic limit and considering different values of the spring stiffness controlling the avalanche cutoff. Additionally, we investigate the evolution of the height distribution as the external force is ramped up from zero, approaching the critical force from below. Starting from a symmetric height distribution at zero force, the distribution initially develops positive skewness increasing with the external force, followed by a steep drop to the negative value characteristic of the critical point as the depinning transition is reached.

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Phys. Rev. E 113, 014141– Published 28 January, 2026
  • Received 15 August 2025
  • Revised 20 November 2025
  • Accepted 2 January 2026
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