Kondo Effect of Cobalt Adatoms on a Graphene Monolayer Controlled by Substrate-Induced Ripples
文献类型：期刊论文
| 作者 | Ren, JD ; Guo, HM ; Pan, JB ; Zhang, YY ; Wu, X ; Luo, HG ; Du, SX ; Pantelides, ST ; Gao, HJ |
| 刊名 | NANO LETTERS
 |
| 出版日期 | 2014 |
| 卷号 | 14期号:7页码:4011 |
| ISSN号 | 1530-6984 |
| 关键词 | Kondo effect scanning tunneling microscopy graphene magnetic impurity surface adsorption |
| 通讯作者 | Pantelides, ST (reprint author), Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37240 USA. |
| 中文摘要 | The Kondo effect, a widely studied phenomenon in which the scattering of conduction electrons by magnetic impurities increases as the temperature T is lowered, depends strongly on the density of states at the Fermi energy. It has been predicted by theory that magnetic impurities on free-standing monolayer graphene exhibit the Kondo effect and that control of the density of states at the Fermi level by external means can be used to switch the effect on and off. However, though transport data for Co adatoms on graphene monolayers on several substrates have been reported, there exists no evidence for a Kondo effect. Here we probe the role of the substrate on the Kondo effect of Co on graphene by combining low-temperature scanning tunneling microscopy and spectroscopy measurements with density functional theory calculations. We use a Ru(0001) substrate that is known to cause graphene to ripple, yielding a moire superlattice. The experimental data show a sharp Kondo resonance peak near the Fermi energy from only Co adatoms at the edge of atop regions of the moire pattern. The theoretical results show that the variation of the distance from the graphene to the Ru substrate, which controls the spin polarization and local density of states at the Fermi energy, is the key factor for the appearance of the Kondo resonance. The results suggest that rippling of graphene by suitable substrates is an additional lever for tuning and selectively switching the appearance of the Kondo effect. |
| 资助信息 | National Natural Science Foundation of China [51210003, 61390500, 61274011, 11325417]; National "973" projects of China [2011CB309703, 2013CBA01600]; Chinese Academy of Sciences; Shanghai supercomputer center; U.S. DOE Office of Basic Energy Sciences; Vanderbilt by the McMinn Endowment; U.S. DOE |
| 语种 | 英语 |
| 公开日期 | 2015-04-14 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/59341]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Ren, JD,Guo, HM,Pan, JB,et al. Kondo Effect of Cobalt Adatoms on a Graphene Monolayer Controlled by Substrate-Induced Ripples[J]. NANO LETTERS,2014,14(7):4011. |
| APA | Ren, JD.,Guo, HM.,Pan, JB.,Zhang, YY.,Wu, X.,...&Gao, HJ.(2014).Kondo Effect of Cobalt Adatoms on a Graphene Monolayer Controlled by Substrate-Induced Ripples.NANO LETTERS,14(7),4011. |
| MLA | Ren, JD,et al."Kondo Effect of Cobalt Adatoms on a Graphene Monolayer Controlled by Substrate-Induced Ripples".NANO LETTERS 14.7(2014):4011. |
入库方式： OAI收割
来源：物理研究所
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