Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstraße 2, D-30167 Hannover, Germany.
J Phys Condens Matter. 2013 Oct 2;25(39):392001. doi: 10.1088/0953-8984/25/39/392001. Epub 2013 Aug 14.
Graphene structures of finite size are expected to reveal exceptional electronic and magnetic properties which are highly attractive for future nano-technological applications. In this study we have looked at the edge-states in graphene nanoribbons (GNR) grown by self-assembly on mesa structured SiC(0001) templates. By means of a 4-tip STM/SEM system, both local spectroscopy and lateral transport have been performed in situ on the same nanostructures. The conductance in these structures was found to be e(2)/h for temperatures up to 400 K. Scanning tunneling spectroscopy clearly reveals edge-localized states on these ribbons. The local bonding of these ribbons to their support turns out to be essential in order to preserve the metallicity of the edge-states.
预计有限尺寸的石墨烯结构将表现出特殊的电子和磁性，这对未来的纳米技术应用极具吸引力。在这项研究中，我们研究了在 mesa 结构的 SiC(0001)模板上自组装生长的石墨烯纳米带(GNR)中的边缘态。通过一个 4 探针 STM/SEM 系统，我们在同一纳米结构上原位进行了局部光谱和横向传输测量。在高达 400 K 的温度下，这些结构的电导被发现为 e(2)/h。扫描隧道光谱学清楚地揭示了这些 ribbons 上的边缘局域态。这些 ribbons 与其支撑的局部键合对于保持边缘态的金属性至关重要。
