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arXiv 0811.0714cond-mat.mtrl-scicond-mat.other
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强磁场中交换能与自旋相关的精确和近似关系

Exact and approximate relations for the spin-dependence of the exchange energy in high magnetic fields

J. M. Morbec, K. Capelle

摘要:

外磁场中任意共线自旋多体系统的交换能是自旋分辨电荷和电流密度$E_x[n_{\uparrow},n_{\downarrow},j_{\uparrow},j_{\downarrow}]$的函数。在密度泛函理论(DFT)的框架内,我们证明了该泛函对四种密度的依赖性可以从两个极限中的任意一个完全重构:完全极化系统或完全非极化系统.从非极化系统的极限重构得到了从自旋DFT到电流DFT的Oliver-Perdew自旋标度关系的推广。从一个完全极化系统的极限重建是用来获得高场形式的局部自旋密度近似电流DFT和磁场DFT。

英文摘要:

The exchange energy of an arbitrary collinear-spin many-body system in an external magnetic field is a functional of the spin-resolved charge and current densities, $E_x[n_{\uparrow},n_{\downarrow},j_{\uparrow},j_{\downarrow}]$. Within the framework of density-functional theory (DFT), we show that the dependence of this functional on the four densities can be fully reconstructed from either of two extreme limits: a fully polarized system or a completely unpolarized system. Reconstruction from the limit of an unpolarized system yields a generalization of the Oliver-Perdew spin scaling relations from spin-DFT to current-DFT. Reconstruction from the limit of a fully polarized system is used to derive the high-field form of the local-spin-density approximation to current-DFT and to magnetic-field DFT.

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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