Graphene−Metal Interface: Two-Terminal Resistance of Low-Mobility Graphene in High Magnetic Fields

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• 作者：Vojislav Krstić ; Dirk Obergfell ; Stefan Hansel ; Geert L. J. A. Rikken ; Janneke H. Blokland ; Mauro S. Ferreira ; Siegmar Roth
• 刊名：Nano Letters
• 出版年：2008
• 出版时间：June 2008
• 年：2008
• 卷：8
• 期：6
• 页码：1700 - 1703
• 全文大小：373K
• 年卷期：v.8,no.6(June 2008)
• ISSN：1530-6992

文摘

The two-terminal magnetotransport of a single graphene layer was investigated up to a field of 55 T. The dependence of the electron transmission probability at the organo−metallic interface between the graphene and the metal electrodes was studied as a function of filling factor and electron density. A resistance-plateau spanning several tens of tesla width was observed. We argue that this plateau originates from an augmented sublattice spin-splitting due to the high surface-impurity concentration of the graphene layer. At electron densities close to the Dirac point, fingerprints of a thermally activated energy gap were observed.