arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1409.6085cond-mat.mtrl-sciphysics.comp-ph
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稳定高效的万原子线性标度第一性原理分子动力学

Stable and Efficient Linear Scaling First-Principles Molecular Dynamics for 10,000+ atoms

Michiaki Arita, David R. Bowler, Tsuyoshi Miyazaki

摘要:

密度泛函理论(DFT)中的线性标度或O(N)方法的最新进展是引人注目的。我们期望基于DFT的第一性原理分子动力学(FPMD)模拟可以使用O(N)技术来处理更真实和复杂系统。然而,O(N)FPMD模拟的例子很少,到目前为止,模拟的准确性或可靠性的信息是非常有限的。在本文中,我们表明,有效的和强大的O(N)FPMD模拟现在可能的组合扩展拉格朗日Born-Oppenheimer分子动力学方法,这是最近提出的Niklasson等人(物理评论Lett. 100,123004(2008))和作为O(N)技术的密度矩阵方法。使用我们的线性标度DFT代码Conquest,我们研究了精确O(N)FPMD的可靠计算条件,并证明我们现在能够对包含32,768个原子的非常大的系统进行实际和可靠的自洽FPMD模拟。

英文摘要:

The recent progress of linear-scaling or O(N) methods in the density functional theory (DFT) is remarkable. We expect that first-principles molecular dynamics (FPMD) simulations based on DFT can now treat more realistic and complex systems using the O(N) technique. However, very few examples of O(N) FPMD simulations exist so far and the information for the accuracy or reliability of the simulations is very limited. In this paper, we show that efficient and robust O(N) FPMD simulations are now possible by the combination of the extended Lagrangian Born-Oppenheimer molecular dynamics method, which was recently proposed by Niklasson et al (Phys. Rev. Lett. 100, 123004 (2008)), and the density matrix method as an O(N) technique. Using our linear-scaling DFT code Conquest, we investigate the reliable calculation conditions for the accurate O(N) FPMD and demonstrate that we are now able to do actual and reliable self-consistent FPMD simulation of a very large system containing 32,768 atoms.

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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