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arXiv 2303.02519cond-mat.mtrl-sci
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通过温度相关的电子热漫散射验证机器学习的原子间势

Validation of machine-learned interatomic potentials via temperature-dependent electron thermal diffuse scattering

Dennis S. Kim, Michael Xu, James M. LeBeau

摘要:

机器学习的原子间相互作用势(MLIP)在准确描述材料的物理性质方面显示出了希望,但需要更高通量的验证方法。在这里,我们证明了使用MLIPs和分子动力学可以准确地捕捉势能景观和晶格动力学,需要描述电子热漫散射。使用SrTiO $_3$作为一个试验台,在低温和室温下,我们比较电子热漫散射模拟使用不同的近似,将热运动。只有当模拟是基于量子力学精确的MLIPs结合路径积分分子动力学,包括核量子效应,有很好的协议与实验\end{abstract}

英文摘要:

Machine-learned interatomic potentials (MLIPs) show promise in accurately describing the physical properties of materials, but there is a need for a higher throughput method of validation. Here, we demonstrate using that MLIPs and molecular dynamics can accurately capture the potential energy landscape and lattice dynamics that are needed to describe electron thermal diffuse scattering. Using SrTiO$_3$ as a test-bed at cryogenic and room temperatures, we compare electron thermal diffuse scattering simulations using different approximations to incorporate thermal motion. Only when the simulations are based on quantum mechanically accurate MLIPs in combination with path-integral molecular dynamics that include nuclear quantum effects, there is excellent agreement with experiment\end{abstract}

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