• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physical review >Fingerprints of Dirac points in first-principles calculations of scanning tunneling spectra of graphene on a metal substrate
【24h】

Fingerprints of Dirac points in first-principles calculations of scanning tunneling spectra of graphene on a metal substrate

机译：在金属基板上石墨烯的扫描隧道光谱的第一性原理计算中的狄拉克点指纹

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Graphene physisorbed on a metal has its characteristic Dirac cones preserved in the band structure, but the Fermi level of the system is shifted due to the interaction with the substrate. Based on density functional calculations with van der Waals corrections, we present a method to determine the position of the Dirac point with respect to the Fermi level from the measured scanning tunneling spectra (STS). It has been demonstrated that the dips in both simulated local density of states and in the observed dl/dV profiles are indeed the fingerprints of the Dirac points. The type and the level of doping can be then inferred directly from the STS data without any additional experimental technique. Test calculations of graphene on a Cu(111) substrate have shown that the predicted position of the Dirac point is in close proximity to the experimental value reported in the recent studies. Moreover, simulations for graphene on a Pt(111) surface allow us to explain the apparent contradictions in the state-of-the-art experimental works.
机译：物理吸附在金属上的石墨烯在带结构中保留了其特征狄拉克锥，但由于与底物的相互作用，系统的费米能级发生了变化。基于范德华校正的密度泛函计算，我们提出了一种从测量的扫描隧道光谱（STS）确定狄拉克点相对于费米能级的位置的方法。已经证明，在模拟的局部状态密度和在观察到的dl / dV曲线中的下降确实是狄拉克点的指纹。然后可以直接从STS数据推断出掺杂的类型和水平，而无需任何其他实验技术。 Cu（111）衬底上石墨烯的测试计算表明，狄拉克点的预测位置与最近研究中报道的实验值非常接近。此外，在Pt（111）表面上对石墨烯的模拟使我们能够解释最先进的实验工作中的明显矛盾。

著录项

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