An internal mode shifts the depinning threshold of dissociated dislocations without changing universality
Abstract
Driven elastic manifolds exhibit a depinning transition whose large-scale behavior is governed by a nonequilibrium critical fixed point. Real interfaces, however, often possess internal degrees of freedom, raising the question of whether such modes alter depinning universality or only nonuniversal properties of the transition. We address this question for a dissociated dislocation, whose two Shockley partials define a fluctuating stacking-fault width driven by correlated random-alloy stresses. Comparing exact thresholds on identical disorder realizations with the width either free or frozen, we find that width fluctuations leave the depinning universality class unchanged: the roughness exponent ζ and correlation-length exponent ν remain the same even when the width becomes strongly fluctuating and locally multistable. The threshold, however, shifts. The shift is governed by the elastic crossover length of the internal mode rather than by multistability, and can have either sign. An infinite-range mean-field treatment misses this mechanism. With the physical two-partial elastic kernel and disorder calibrated against measured strengths, width fluctuations raise the athermal critical resolved shear stress by 10-35% over that of a rigid dissociated dislocation. An internal mode can thus be irrelevant at the depinning fixed point while remaining quantitatively important for where the transition occurs.
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BibTeX
@misc{alava2026internal,
title = {{An internal mode shifts the depinning threshold of dissociated dislocations without changing universality}},
author = {Mikko J. Alava and Tero J. Mäkinen},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.41451},
eprint = {2610.41451},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.41451},
}
RIS
TY - UNPB
TI - An internal mode shifts the depinning threshold of dissociated dislocations without changing universality
AU - Mikko J. Alava
AU - Tero J. Mäkinen
PY - 2026
DA - 2026/10/30
PB - arXiv
DO - 10.48550/arxiv.2610.41451
UR - https://arxiv.org/abs/2610.41451
AB - Driven elastic manifolds exhibit a depinning transition whose large-scale behavior is governed by a nonequilibrium critical fixed point. Real interfaces, however, often possess internal degrees of freedom, raising the question of whether such modes alter depinning universality or only nonuniversal properties of the transition. We address this question for a dissociated dislocation, whose two Shockley partials define a fluctuating stacking-fault width driven by correlated random-alloy stresses. Comparing exact thresholds on identical disorder realizations with the width either free or frozen, we find that width fluctuations leave the depinning universality class unchanged: the roughness exponent ζ and correlation-length exponent ν remain the same even when the width becomes strongly fluctuating and locally multistable. The threshold, however, shifts. The shift is governed by the elastic crossover length of the internal mode rather than by multistability, and can have either sign. An infinite-range mean-field treatment misses this mechanism. With the physical two-partial elastic kernel and disorder calibrated against measured strengths, width fluctuations raise the athermal critical resolved shear stress by 10-35% over that of a rigid dissociated dislocation. An internal mode can thus be irrelevant at the depinning fixed point while remaining quantitatively important for where the transition occurs.
ER -