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arXiv 0902.1584cond-mat.mtrl-scicond-mat.other
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最大定域Wannier函数的线性组合赝原子轨道方法:实现及其在过渡金属-苯配合物中的应用

Maximally localized Wannier function within linear combination of pseudo-atomic orbital method: Implementation and applications to transition-metal-benzene complex

Hongming Weng, Taisuke Ozaki, Kiyoyuki Terakura

摘要:

利用伪原子轨道线性组合方法构造了最大定域Wannier函数。详细的分析,使用MLWFs适用于三个密切相关的材料,单苯(Bz)分子,有机金属钒Bz无限链,和V $_2$ Bz $_{3}$三明治集群。结果表明:(1)对于无限长链,Kanamori和Terakura关于铁磁(FM)态稳定性机制的基本假设是正确的;(2)对于V $_2$ Bz $_3$,边缘Bz s和中间Bz之间的轨道能量差所起的重要作用是新发现的:边缘Bz s的p个$δ$态的在位能量高于中间Bz的p个$δ$态的在位能量,这进一步降低了V $_2$ Bz $_3$的FM稳定性。

英文摘要:

Construction of maximally localized Wannier functions (MLWFs) has been implemented within the linear combination of pseudo-atomic orbital (LCPAO) method. Detailed analysis using MLWFs is applied to three closely related materials, single benzene (Bz) molecule, organometallic Vanadium-Bz infinite chain, and V$_2$Bz$_{3}$ sandwich cluster. Two important results come out from the present analysis: 1) for the infinite chain, the validity of the basic assumption in the mechanism of Kanamori and Terakura for the ferromagnetic (FM) state stability is confirmed; 2) for V$_2$Bz$_3$, an important role played by the difference in the orbital energy between the edge Bzs and the middle Bz is newly revealed: the on-site energy of p$δ$ states of edge Bzs is higher than that of middle Bz, which further reduces the FM stability of V$_2$Bz$_3$.

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