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arXiv 1111.1895cond-mat.str-el
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电子关联在Ga中的作用

Role of electronic correlations in Ga

Zhiyong Zhu, Xuhui Wang, Udo Schwingenschlögl

摘要:

提出了一种适用于局部化程度较低的$p$电子的扩展平均场(AMF)泛函,用于定量计算$α$ -Ga中电子关联的影响.局域密度近似(LDA)和广义梯度近似(GGA)是已知的错误预测Ga的位置参数。扩展的AMF功能连同现场库仑相互作用的$U_{\rm eff}=1.1$ eV,从约束LDA计算,减少了约20%的偏差。随着电子关联的对称性降低原来是符合Ga相图。

英文摘要:

An extended around mean field (AMF) functional for less localized $p$ electrons is developed to quantify the influence of electronic correlations in $α$-Ga. Both the local density approximation (LDA) and generalized gradient approximation (GGA) are known to mispredict the Ga positional parameters. The extended AMF functional together with an onsite Coulomb interaction of $U_{\rm eff}=1.1$ eV, as obtained from constraint LDA calculations, reduces the deviations by about 20%. The symmetry lowering coming along with the electronic correlations turns out to be in line with the Ga phase diagram.

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