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arXiv 1708.09274cond-mat.mtrl-sci
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复杂功能材料原子结构的高效贝叶斯推断

Efficient Bayesian Inference of Atomistic Structure in Complex Functional Materials

Milica Todorović, Michael U. Gutmann, Jukka Corander, Patrick Rinke

摘要:

根据其预期的技术应用定制先进的有机/无机异质器件的功能特性需要了解和控制器件内部的微观结构。原子量子力学模拟方法为单个配置提供准确的能量和属性,然而,找到最有利的配置仍然是计算上的限制。我们提出了一个“积木”为基础的贝叶斯优化结构搜索(BOSS)的方法来解决扩展的有机/无机界面问题,并证明其在分子表面吸附研究的可行性。在BOSS中,无似然贝叶斯方案加速了在主动学习期间通过采样配置数量识别材料能量景观,从而实现具有高化学准确性的结构推断,并具有大型模拟单元。这使我们能够确定几个最有利的分子吸附配置的$\mathrm{C}_{60}$的(101)表面上的$\mathrm{TiO}_2$晶体和澄清的关键分子表面相互作用的结构组装。推断的结构与详细的实验图像,这种表面吸附物,表现出良好的预测能力的BOSS和开放的路线,大规模的表面吸附研究的分子聚集体和薄膜。

英文摘要:

Tailoring the functional properties of advanced organic/inorganic heterogeonous devices to their intended technological applications requires knowledge and control of the microscopic structure inside the device. Atomistic quantum mechanical simulation methods deliver accurate energies and properties for individual configurations, however, finding the most favourable configurations remains computationally prohibitive. We propose a 'building block'-based Bayesian Optimisation Structure Search (BOSS) approach for addressing extended organic/inorganic interface problems and demonstrate its feasibility in a molecular surface adsorption study. In BOSS, a likelihood-free Bayesian scheme accelerates the identification of material energy landscapes with the number of sampled configurations during active learning, enabling structural inference with high chemical accuracy and featuring large simulation cells. This allowed us to identify several most favourable molecular adsorption configurations for $\mathrm{C}_{60}$ on the (101) surface of $\mathrm{TiO}_2$ anatase and clarify the key molecule-surface interactions governing structural assembly. Inferred structures were in good agreement with detailed experimental images of this surface adsorbate, demonstrating good predictive power of BOSS and opening the route towards large-scale surface adsorption studies of molecular aggregates and films.

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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