arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2201.10237cond-mat.mtrl-sciphysics.comp-ph
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铁磁和液态铁的多尺度机器学习原子间势

Multiscale machine-learning interatomic potentials for ferromagnetic and liquid iron

Jesper Byggmästar, Giorgos Nikoulis, Aslak Fellman, Fredric Granberg, Flyura Djurabekova, Kai Nordlund

摘要:

我们开发并比较了四种铁原子间势:一个简单机械学习的嵌入原子方法(EAM)势,一个机器学习的两体和三体相关项的势,一个机器学习的EAM和三体项的势,以及一个SOAP描述符的高斯近似势。所有的势都被训练到用密度泛函理论计算的体心立方和液体结构的相同的不同数据库。四个潜在的代表不同层次的复杂性和跨越三个数量级的计算成本。前三个潜在的制表和评估有效地使用三次样条插值,而第四个实施没有额外的优化。我们比较和讨论的优势,每一个实施,可转移性和适用性方面的平衡所需的精度与计算成本。

英文摘要:

We develop and compare four interatomic potentials for iron: a simple machine-learned embedded atom method (EAM) potential, a potential with machine-learned two- and three-body-dependent terms, a potential with machine-learned EAM and three-body terms, and a Gaussian approximation potential with the SOAP descriptor. All potentials are trained to the same diverse database of body-centered cubic and liquid structures computed with density functional theory. The four presented potentials represent different levels of complexity and span three orders of magnitude in computational cost. The first three potentials are tabulated and evaluated efficiently using cubic spline interpolations, while the fourth one is implemented without additional optimization. We compare and discuss the advantages of each implementation, transferability and applicability in terms of the balance between required accuracy versus computational cost.

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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