...
首页> 外文期刊>Physical review >Epitaxial graphene monolayer and bilayers on Ru(0001): Ab initio calculations
【24h】

Epitaxial graphene monolayer and bilayers on Ru(0001): Ab initio calculations

机译:Ru(0001)上的外延石墨烯单层和双层:从头算

获取原文
获取原文并翻译 | 示例
           

摘要

We studied very large graphene/Ru systems by ab initio calculations. It is shown that the graphene mono-layer on Ru is nearly flat rather than strongly corrugated. The large corrugation is found to be unfavorable and disagrees with the observed bias dependence of scanning tunnel microscope images. The C-Ru bonds are metallic instead of covalent. A new moire structure arises between graphene bilayers and the generally supposed Bernal stacking is broken. The second layer has higher density of C atoms and is slightly corrugated. While the electronic states of the first graphene layer are shifted down by about 1 eV, the electronic structure of the second one resembles that of the free graphene, in good agreement with the experiments.
机译:通过从头算计算,我们研究了非常大的石墨烯/ Ru系统。结果表明,Ru上的石墨烯单层几乎是平坦的,而不是强波纹状的。发现大的波纹是不利的,并且与扫描隧道显微镜图像的观察到的偏倚依赖性不同。 C-Ru键是金属的而不是共价的。在石墨烯双层之间出现了新的莫尔条纹结构,通常认为的伯纳尔堆叠破裂。第二层具有较高的C原子密度,并且略微呈波纹状。当第一石墨烯层的电子状态下移约1 eV时,第二石墨烯层的电子结构类似于游离石墨烯的电子结构,与实验非常吻合。

著录项

  • 来源
    《Physical review》 |2010年第4期|P.045425.1-045425.5|共5页
  • 作者

    Xiangyang Peng; Rajeev Ahuja;

  • 作者单位

    Laboratory for Quantum Engineering and Micro-Nano Energy Technology, Faculty of Materials, Optoelectronics and Physics,Xiangtan University, 411105, Hunan, China Condensed Matter Theory Group, Department of Physics, Uppsala University, P.O. Box 530, SE-751 21 Uppsala, Sweden;

    Condensed Matter Theory Group, Department of Physics, Uppsala University, P.O. Box 530, SE-751 21 Uppsala, Sweden;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号