机器学习的Kohn-Sham哈密尔顿绘图用于非adiabatic分子动力学
Mohammad Shakiba1, Alexey V Akimov1
1Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States.
Journal of chemical theory and computation
|April 6, 2024
概括
我们开发了一种机器学习方法,快速绘制大型原子系统的电子哈密尔顿数. 这种方法加速了数量级的计算,同时保持了动态模拟的高精度.
科学领域:
- 计算化学的计算化学
- 材料科学 材料科学 材料科学
- 机器学习 机器学习
背景情况:
- 准确的电子结构计算对于理解材料特性和动态至关重要.
- 解决Kohn-Sham方程的传统方法在计算上可能很昂贵,特别是在大型系统中.
- 非自相一致的哈密尔顿式提供了一个更快的替代方案,但缺乏动态模拟的准确性.
研究的目的:
- 开发一种机器学习 (ML) 方法,以实现高效的哈密尔顿映射.
- 为了创建一个快速的替代哈密尔顿计算器用于非adiabatic动力学模拟.
- 为了能够准确地模拟大型原子系统,并探索激发能量放松动态.
主要方法:
- 训练了一种机器学习模型,将非自相一致的Kohn-Sham哈密尔顿数映射到几乎自相一致的哈密尔顿数.
- 输入和输出特征是哈密尔顿矩阵,在不同的理论水平上计算.
- 该ML模型应用于刺激能量放松的非adiabatic动力学模拟.
主要成果:
- 基于ML的哈密尔顿映射显著加快计算 (数量级).
- 该方法的准确性与分子轨道和能量的传统计算相美.
- 在C60富勒烯和Si75H64量子点中对激发能量放松的模拟提供了新的见解.
结论:
- 开发的ML方法简单,高效,可扩展和广泛适用.
- 它使复杂系统的准确和快速模拟成为可能,推动了激发能量动态的研究.
- 这种方法为计算材料科学和化学提供了一个强大的工具.
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