Eom Daejin, Prezzi Deborah, Rim Kwang Taeg, Zhou Hui, Lefenfeld Michael, Xiao Shengxiong, Nuckolls Colin, Hybertsen Mark S, Heinz Tony F, Flynn George W
Nanoscale Science and Engineering Center, Columbia University, New York, New York 10027, USA.
Nano Lett. 2009 Aug;9(8):2844-8. doi: 10.1021/nl900927f.
We have grown well-ordered graphene adlayers on the lattice-matched Co(0001) surface. Low-temperature scanning tunneling microscopy measurements demonstrate an on-top registry of the carbon atoms with respect to the Co(0001) surface. The tunneling conductance spectrum shows that the electronic structure is substantially altered from that of isolated graphene, implying a strong coupling between graphene and cobalt states. Calculations using density functional theory confirm that structures with on-top registry have the lowest energy and provide clear evidence for strong electronic coupling between the graphene pi-states and Co d-states at the interface.
我们已经在晶格匹配的Co(0001)表面上生长出了有序的石墨烯吸附层。低温扫描隧道显微镜测量表明，碳原子相对于Co(0001)表面呈顶位对齐。隧道电导谱显示，电子结构与孤立石墨烯的电子结构有很大不同，这意味着石墨烯与钴态之间存在强耦合。使用密度泛函理论进行的计算证实，具有顶位对齐的结构能量最低，并为界面处石墨烯π态与Co d态之间的强电子耦合提供了明确证据。
