First-principles investigation of monatomic gold wires under tension

First-principles investigation of monatomic gold wires under tension
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张力下单原子金线的第一性原理研究

DOI:
10.1016/j.commatsci.2019.109226
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发表时间:
2020
影响因子:
3.3
通讯作者:
Aihui Zhou
Aihui Zhou
中科院分区:
材料科学3区
文献类型:
--
作者:
Lianhua He;Fang Liu;Ju Li;Gian-Marco Rignanese;Aihui Zhou

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在密度泛函理论下,对Au无限长单原子链进行了从头算赝势全能计算。我们用密度泛函微扰理论研究了这些金丝的声子谱随应变的变化。我们的结果表明,与Ribeiro和Cohen[Phys]所说的相反,似乎不存在线性链稳定的应变范围。修订本B 68(2003年)035423]。对于低应变,锯齿链是稳定的几何构型;而对于高应变,具有两个或更多排列的金原子的链更稳定。在这两个区域之间的极限,我们预测过渡结构(不对称的锯齿形链)是最稳定的。
Ab initiopseudopotential total-energy calculations on infinite monatomic chains of Au are performed within density functional theory. We use the density functional perturbation theory to study the phonon spectra of these gold wires as a function of strain. Our results show that there does not seem to be a range of strain for which the linear chain is stable, contrary to what was stated by Ribeiro and Cohen [Phys. Rev. B 68 (2003) 035423]. For low strain, the zigzag chain is the stable geometry; while for higher strain, the chains with two or more aligned gold atoms are found to be more stable. At the limit between these two regimes, we predict a transition structure (an asymmetric zigzag chain) to be the most stable.
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