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arXiv 2301.04734cond-mat.str-el
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由关联电子系统的谱矩构造Wannier函数

Construction of Wannier functions from the spectral moments of correlated electron systems

Frank Freimuth, Stefan Blügel, Yuriy Mokrousov

摘要:

当考虑前四个谱矩时,可以描述标准Kohn-Sham(KS)密度泛函理论(DFT)中缺失的谱特征,例如上、下Hubbard带以及谱卫星峰,并且可以校正带宽。因此,我们最近设计了一个\textit{moment-functional based spectral density functional theory}(MFBSDFT)。然而,在理论固态物理中的许多计算工具,如最大局域化的Wannier函数(MLWF)的建设,已经开发了KS-DFT和需要修改,如果他们被认为是用于MFbSDFT。在这里,我们展示了如何广义Wannier函数可以从前四个谱矩矩阵构造。我们将这些函数称为\textit{maximally localized spectral moment Wannier functions}(MLSMWF)。我们演示了如何MLSMWFs可以用来计算反常霍尔效应(AHE)在fcc镍的Wannier插值。更一般地,可以根据第一$2P$矩($P=1,2,3,\dots$)来计算MLSMWF。使用4个以上的矩打开了在MFBSDFT中准确再现所有光谱特征的前景。

英文摘要:

When the first four spectral moments are considered, spectral features missing in standard Kohn-Sham (KS) density-functional theory (DFT), such as upper and lower Hubbard bands, as well as spectral satellite peaks, can be described, and the bandwidths can be corrected. Therefore, we have devised a \textit{moment-functional based spectral density functional theory} (MFbSDFT) recently. However, many computational tools in theoretical solid state physics, such as the construction of maximally localized Wannier functions (MLWFs), have been developed for KS-DFT and require modifications if they are supposed to be used in MFbSDFT. Here, we show how generalized Wannier functions may be constructed from the first four spectral moment matrices. We call these functions \textit{maximally localized spectral moment Wannier functions} (MLSMWFs). We demonstrate how MLSMWFs may be used to compute the anomalous Hall effect (AHE) in fcc Ni by Wannier interpolation. More generally, MLSMWFs may be computed from the first $2P$ moments ($P=1,2,3,\dots$). Using more than 4 moments opens the perspective of reproducing all spectral features accurately in MFbSDFT.

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