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arXiv 1605.07201cond-mat.mtrl-scicond-mat.mes-hallmath-phmath.MP
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极大局部化Wannier函数的鲁棒确定

Robust determination of maximally-localized Wannier functions

Éric Cancès, Antoine Levitt, Gianluca Panati, Gabriel Stoltz

摘要:

提出了一种确定最大局部化Wannier函数的算法。该算法,基于最近的理论发展,不需要任何物理输入,如初始猜测的Wannier函数,不像流行的计划的基础上的投影方法。我们讨论了如何投影方法可以失败的细网格时,最初的猜测是太远的MLWF。我们证明,我们的算法是能够找到本地化的Wannier功能,通过测试二维系统,半导体的简化模型,和现实的DFT系统接口与Wannier 90代码。我们还测试了我们的算法的Halcantine和凯恩-梅勒模型,以研究它是如何失败的拓扑障碍的存在。

英文摘要:

We propose an algorithm to determine Maximally Localized Wannier Functions (MLWFs). This algorithm, based on recent theoretical developments, does not require any physical input such as initial guesses for the Wannier functions, unlike popular schemes based on the projection method. We discuss how the projection method can fail on fine grids when the initial guesses are too far from MLWFs. We demonstrate that our algorithm is able to find localized Wannier functions through tests on two-dimensional systems, simplified models of semiconductors, and realistic DFT systems by interfacing with the Wannier90 code. We also test our algorithm on the Haldane and Kane-Mele models to examine how it fails in the presence of topological obstructions.

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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