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arXiv 1402.1372cond-mat.mtrl-sci
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氢在石墨烯上吸附几何结构的密度泛函理论和紧束缚研究

Density-Functional Theory and Tight-Binding Studies of the Geometry of Hydrogen Adsorbed on Graphynes

Hunpyo Lee, Jahyun Koo, Massimo Capone, Yongkyung Kwon, Hoonkyung Lee

摘要:

利用密度泛函理论和紧束缚方法,我们研究了不同石墨炔结构中吸附氢原子不同有利几何构型的物理起源,以及与电子性质的关系。特别地,对于$α$ -石墨炔,H原子被吸附在平面内,并且它们在所有其他石墨炔(包括6,6,12-石墨炔)中呈现倾斜构型。通过一个简单的紧束缚模型确定了不同构型的起源,并通过调节sp $^2$键合的C原子和与H原子杂化的sp键合的C原子之间的跳跃来控制。详细讨论了H原子的几何构型变化对能隙等电子性质的影响。

英文摘要:

Using density-functional theory and a tight-binding approach we investigate the physical origin of distinct favourable geometries of adsorbed hydrogen atoms in various graphyne structures, and the relation with electronic properties. In particular, H atoms are adsorbed in-plane for $α$-graphyne, and they assume an oblique configuration in all other graphynes, including 6,6,12-graphyne. The origin of different configurations is identified by means of a simple tight-binding model and it is controlled by the tuning of the hopping between sp$^2$-bonded C atoms and sp-bonded C atoms hybridized with the H atoms. We discuss in details how the geometry change of the attached H atom tunes the electronic properties like energy gap.

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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