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arXiv 1704.08019cond-mat.mtrl-sci
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石墨烯中嵌入Si图形的结构和能量学

Structure and energetics of embedded Si patterns in graphene

Daryoush Nosraty-Alamdary, Jani Kotakoski, Toma Susi

摘要:

最近的实验揭示了电子束精确操纵石墨烯中硅杂质的可能性。受这些发现和对金属表面量子化学的研究的启发,问题出现了在六方晶格内可能存在什么样的嵌入式Si结构,以及这些结构如何受到Si对$sp^{3}$杂化的偏好所引起的扭曲的限制。在这项工作中,我们研究了石墨烯中基本硅图案的几何形状和稳定性,包括直线,六边形,三角形,圆形和正方形。由于所需晶胞的大小,为了获得松弛的几何形状,我们使用经验键级势作为密度泛函理论的起点。尽管有一些有趣的差异,经典的几何形状提供了一个有效的途径,模拟大型结构。

英文摘要:

Recent experiments have revealed the possibility of precise electron beam manipulation of silicon impurities in graphene. Motivated by these findings and studies on metal surface quantum corrals, the question arises what kind of embedded Si structures are possible within the hexagonal lattice, and how these are limited by the distortion caused by the preference of Si for $sp^{3}$ hybridization. In this work, we study the geometry and stability of elementary Si patterns in graphene, including lines, hexagons, triangles, circles and squares. Due to the size of the required unit cells, to obtain the relaxed geometries we use an empirical bond-order potential as a starting point for density functional theory. Despite some interesting discrepancies, the classical geometries provide an effective route for the simulation of large structures.

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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