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arXiv 2201.07751cond-mat.mtrl-sci
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在空间和能量上双重局域化的Wannier函数

Wannier Functions Dually Localized in Space and Energy

Duke University(杜克大学);Nankai University(南开大学)

Aaron Mahler, Jacob Z. Williams, Neil Qiang Su, Weitao Yang

AI总结:

本文提出一种双重局域化Wannier函数方法,结合价带和导带,用于研究硅、乙烯和铜的轨道特性,适用于轨道依赖方法。

摘要:

从布洛赫轨道构建Wannier函数提供了一种单位自由度,可以用来获得具有有利性质的Wannier函数。最小化空间方差是已知的选择;另一个先前用于构建从占据布洛赫 manifold 构造的Wannier函数,最小化空间和能量方差的加权和。与之前的所有工作不同,我们扩展了双重局域化,以包括价带和导带。在费米能附近,这些双重局域化的Wannier函数在硅和乙烯中产生前沿(成键和反键)轨道,在金属铜中产生d轨道特征。因为它们既局域化又保留了轨道能量谱的信息,双重局域化的Wannier函数非常适合将Wannier函数与特定能量范围关联的轨道依赖方法。它们自然诱导分数占据,允许对DFA总能量进行修正。

英文摘要:

The construction of Wannier functions from Bloch orbitals offers a unitary freedom that can be exploited to yield Wannier functions with advantageous properties. Minimizing the spatial variance is a well-known choice; another, previously proposed for Wannier functions constructed from the occupied Bloch manifold, minimizes a weighted sum of spatial and energy variance. Departing from all previous work, we extend dual localization to include both valence and conduction bands together. Near the Fermi energy, these dually localized Wannier functions yield frontier (bonding and antibonding) orbitals in bulk silicon and molecular ethylene, as well as $d$-orbital character in metallic copper. Because they are both localized and retain information about the orbital energy spectrum, dually localized Wannier functions are well suited to orbital-dependent methods that associate Wannier functions with specific energy ranges. They naturally induce fractional occupations, allowing for corrections to the DFA total energy.

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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