arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2212.03096cond-mat.mtrl-sciphysics.comp-ph
收藏

复杂 $\mathrm{Ga}_{2}\mathrm{O}_{3}$ 多晶型物的探索:基于准确且通用的机器学习原子间势

Complex $\mathrm{Ga}_{2}\mathrm{O}_{3}$ Polymorphs Explored by Accurate and General-Purpose Machine-Learning Interatomic Potentials

Junlei Zhao, Jesper Byggmästar, Huan He, Kai Nordlund, Flyura Djurabekova, Mengyuan Hua

AI总结:

本文为 $\mathrm{Ga}_{2}\mathrm{O}_{3}$ 开发了 soapGAP 和 tabGAP 两种机器学习高斯近似势,在保证高精度的同时大幅提升计算效率,并成功用于揭示其液-固相变的复杂动力学机制。

摘要:

$\mathrm{Ga}_{2}\mathrm{O}_{3}$ 是一种宽带隙半导体,在电子学和光电子学应用中具有日益增长的重要性。然而,关于复杂共存的 $\mathrm{Ga}_{2}\mathrm{O}_{3}$ 多晶型物以及低对称性无序结构的性质,仍缺乏关键信息。在本研究中,我们为 $\mathrm{Ga}_{2}\mathrm{O}_{3}$ 开发了两种基于核的机器学习高斯近似势(ML-GAPs),对 $β$/$κ$/$α$/$δ$/$γ$ 多晶型物具有高精度,且对无序的化学计量结构具有通用性。我们并行发布了两个版本的原子间势,即 soapGAP 和 tabGAP,分别实现了出色的精度和极高的加速。我们系统地表明,soapGAP 和 tabGAP 均能重现所有五种多晶型物的结构性质,与 ab initio 结果高度一致,同时与密度泛函理论相比,计算效率分别提升了 $5\times10^{2}$ 和 $2\times10^{5}$ 倍的计算速度。结果表明,液-固相变分三个不同阶段进行:“慢转变”、“快转变”和“仅 Ga 迁移”。我们表明,这种复杂动力学可以通过 O 和 Ga 子晶格在界面层中的不同行为来理解。

英文摘要:

$\mathrm{Ga}_{2}\mathrm{O}_{3}$ is a wide-bandgap semiconductor of emergent importance for applications in electronics and optoelectronics. However, vital information of the properties of complex coexisting $\mathrm{Ga}_{2}\mathrm{O}_{3}$ polymorphs and low-symmetry disordered structures is missing. In this work, we develop two types of kernel-based machine-learning Gaussian approximation potentials (ML-GAPs) for $\mathrm{Ga}_{2}\mathrm{O}_{3}$ with high accuracy for $β$/$κ$/$α$/$δ$/$γ$ polymorphs and generality for disordered stoichiometric structures. We release two versions of interatomic potentials in parallel, namely soapGAP and tabGAP, for excellent accuracy and exceeding speedup, respectively. We systematically show that both the soapGAP and tabGAP can reproduce the structural properties of all the five polymorphs in an exceptional agreement with ab initio results, meanwhile boost the computational efficiency with $5\times10^{2}$ and $2\times10^{5}$ computing speed increases compared to density functional theory, respectively. The results show that the liquid-solid phase transition proceeds in three different stages, a "slow transition", "fast transition" and "only Ga migration". We show that this complex dynamics can be understood in terms of different behavior of O and Ga sublattices in the interfacial layer.

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。

↑