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arXiv physics/9911030physics.comp-phcond-mat.mtrl-sci
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电子结构计算中的单向多重网格法

One-way multigrid method in electronic structure calculations

In-Ho Lee, Yong-Hoon Kim, Richard Martin

摘要:

提出了一种简单有效的基于迭代对角化的单向多重网格方法,用于自洽电子结构的计算。总能量计算是在从粗网格开始的几个不同层次的网格上进行的,波函数被转移到每个更精细的层次。与单个网格计算相比,唯一的变化是原始总能量计算之外的插值和正交归一化步骤,并且仅需要在网格之间传输。这个特性导致了最小的代码更改量,并使我们能够采用复杂的插值方法和非整数比例的网格间距。采用预处理共轭梯度法计算了两个例子,一个量子点和一个带电分子系统。与单级计算相比,使用网格间距为2h、1.5h和h的三个网格级可将计算机时间减少约5倍。

英文摘要:

We propose a simple and efficient one-way multigrid method for self-consistent electronic structure calculations based on iterative diagonalization. Total energy calculations are performed on several different levels of grids starting from the coarsest grid, with wave functions transferred to each finer level. The only changes compared to a single grid calculation are interpolation and orthonormalization steps outside the original total energy calculation and required only for transferring between grids. This feature results in a minimal amount of code change, and enables us to employ a sophisticated interpolation method and noninteger ratio of grid spacings. Calculations employing a preconditioned conjugate gradient method are presented for two examples, a quantum dot and a charged molecular system. Use of three grid levels with grid spacings 2h, 1.5h, and h decreases the computer time by about a factor of 5 compared to single level calculations.

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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