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arXiv 2602.14348cond-mat.softcond-mat.mtrl-sci
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变形表面上的位错动力学

Dislocation dynamics on deformable surfaces

TU Dresden(德累斯顿工业大学);University of Oslo(奥斯陆大学)

Marcello De Donno, Luiza Angheluta, Marco Salvalaglio

AI总结:

本研究提出了一种适用于变形表面的位错动力学模型,揭示了曲率对缺陷运动的影响,并建立了表面-APFC模型以预测和解释曲率-缺陷耦合现象。

摘要:

我们发展了一种完全耦合的理论描述,用于描述可变形晶体表面上的位错动力学,使用连续建模和扩展到曲面几何的振幅-相位晶体(APFC)框架。我们从复振幅演化方程中推导出一般运动学表达式,用于描述位错速度,该表达式也适用于变形表面,通过曲率修正的微分算子。通过数值模拟,我们显示即使小的平面外变形也会通过曲率诱导的自推进、修改的滑动方向和非经典缺陷-缺陷相互作用来重塑缺陷运动的现象学。我们的结果表明,表面几何对缺陷动力学有深刻影响,并建立了表面-APFC模型作为预测和解释曲率-缺陷耦合的有力框架,适用于从刚但可变形的层到保持晶序的软物质表面和膜的广泛系统。

英文摘要:

We develop a fully coupled theoretical description of dislocation dynamics on deformable crystalline surfaces, using continuum modeling and the amplitude-phase-field crystal (APFC) framework extended to curved geometries. We derive a general kinematic expression for dislocation velocity directly from the complex-amplitude evolution equations, which is also applicable to deformed surfaces through curvature-modified differential operators. From numerical simulations, we show that even small out-of-plane deformations reshape the phenomenology of defect motion through curvature-induced self-propulsion, modified glide directions, and non-classical defect-defect interactions. Our results show how surface geometry profoundly influences defect dynamics and establish the surface-APFC model as a powerful framework for predicting and interpreting curvature-defect coupling across a wide range of systems, from stiff but deformable layers to soft matter surfaces and membranes that retain crystalline order.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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