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arXiv 1303.0348cond-mat.mtrl-sciphysics.chem-ph
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投影缀加波方法中的定域原子基组

Localized atomic basis set in the projector augmented wave method

Ask Hjorth Larsen, Marco Vanin, Jens Jørgen Mortensen, Kristian Sommer Thygesen, Karsten Wedel Jacobsen

摘要:

我们提出了一个实施的局域原子轨道基组的投影增广波(PAW)形式主义内的密度泛函理论(DFT)。实空间GPAW代码中的实现为精确但计算要求更高的网格表示提供了补充基集。在两种表示之间无缝切换的可能性意味着可以在计算结束时通过切换到网格来微调采用局部基的模拟,从而结合两种表示的强度以获得最佳性能。通过计算各种分子和固体的原子化能和平衡体积性质,并与网格结果进行比较,验证了该方法的有效性。最后,它演示了如何网格质量的结构优化可以进行显着减少计算工作量之间的网格和基础表示切换。

英文摘要:

We present an implementation of localized atomic orbital basis sets in the projector augmented wave (PAW) formalism within the density functional theory (DFT). The implementation in the real-space GPAW code provides a complementary basis set to the accurate but computationally more demanding grid representation. The possibility to switch seamlessly between the two representations implies that simulations employing the local basis can be fine tuned at the end of the calculation by switching to the grid, thereby combining the strength of the two representations for optimal performance. The implementation is tested by calculating atomization energies and equilibrium bulk properties of a variety of molecules and solids, comparing to the grid results. Finally, it is demonstrated how a grid-quality structure optimization can be performed with significantly reduced computational effort by switching between the grid and basis representations.

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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