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arXiv 2407.04557cond-mat.mtrl-scics.LG
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生成模型中结构约束集成用于量子材料候选物的发现

Structural Constraint Integration in Generative Model for Discovery of Quantum Material Candidates

Massachusetts Institute of Technology(麻省理工学院);Tohoku University(东北大学);Oak Ridge National Laboratory(橡树岭国家实验室);Emory University(埃默里大学)
Ryotaro Okabe, Mouyang Cheng, Abhijatmedhi Chotrattanapituk, Nguyen Tuan Hung, Xiang Fu, Bowen Han, Yao Wang, Weiwei Xie, Robert J. Cava, Tommi S. Jaakkola, Yon… 展开作者

Ryotaro Okabe, Mouyang Cheng, Abhijatmedhi Chotrattanapituk, Nguyen Tuan Hung, Xiang Fu, Bowen Han, Yao Wang, Weiwei Xie, Robert J. Cava, Tommi S. Jaakkola, Yongqiang Cheng, Mingda Li

AI总结:

本文提出SCIGEN方法,通过在扩散模型每一步对去噪结构进行掩码并融入约束结构,实现受几何模式约束的条件采样,并利用阿基米德晶格约束生成大量化合物,经DFT验证展示其在量子材料候选物发现中的有效性。

摘要:

已知的有机分子数以十亿计,但已发现的功能性无机材料只占极小一部分,这对于寻找新量子材料的研究群体而言是一个尤为相关的问题。基于机器学习的生成模型,尤其是扩散模型,近期取得的进展为生成新的稳定材料展现出巨大前景。然而,将几何模式集成到材料生成中仍然是一个挑战。在此,我们提出生成模型中的结构约束集成(SCIGEN)。我们的方法可以通过在每个扩散步骤之前对去噪结构进行策略性掩码,并用扩散后的约束结构替代,从而修改任何已训练的生成式扩散模型,以引导生成过程朝向受约束的输出。此外,我们从数学上证明SCIGEN能够有效地从原始分布中进行条件采样,这对于生成稳定的受约束材料至关重要。我们使用阿基米德晶格作为原型约束生成了八百万种化合物,其中超过10%通过了多阶段稳定性预筛选。对26,000种存留化合物进行的高通量密度泛函理论(DFT)计算表明,超过50%在DFT层面通过了结构优化。由于量子材料的性质与几何模式密切相关,我们的结果表明SCIGEN为生成量子材料候选物提供了一个通用框架。

英文摘要:

Billions of organic molecules are known, but only a tiny fraction of the functional inorganic materials have been discovered, a particularly relevant problem to the community searching for new quantum materials. Recent advancements in machine-learning-based generative models, particularly diffusion models, show great promise for generating new, stable materials. However, integrating geometric patterns into materials generation remains a challenge. Here, we introduce Structural Constraint Integration in the GENerative model (SCIGEN). Our approach can modify any trained generative diffusion model by strategic masking of the denoised structure with a diffused constrained structure prior to each diffusion step to steer the generation toward constrained outputs. Furthermore, we mathematically prove that SCIGEN effectively performs conditional sampling from the original distribution, which is crucial for generating stable constrained materials. We generate eight million compounds using Archimedean lattices as prototype constraints, with over 10% surviving a multi-staged stability pre-screening. High-throughput density functional theory (DFT) on 26,000 survived compounds shows that over 50% passed structural optimization at the DFT level. Since the properties of quantum materials are closely related to geometric patterns, our results indicate that SCIGEN provides a general framework for generating quantum materials candidates.

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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