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Graphene (Prof. Weber)

Graphene, a single sheet of graphite, is one of the most exciting materials today. We work on a particular species of graphene: high-quality epitaxial graphene on SiC (0001), which can be routinely fabricated on the wafer scale in our laboratories. We consider this material as most promising for electronic applications in science and technology. In particular, it allows due to its specific properties fundamental solid state physics experiments that can not be performed with conventional materials.

We build devices using epitaxial graphene. We investigate charge transport of large-area sheets, which undisclose the physics of quasi-infinite two-dimensional metals. In graphene bilayers, we discovered new physics resulting from (partial) dislocations, and a resulting mosaic of bilayer areas that differ in their stacking. We investigate graphene-graphene nanocontacts, which give new access to molecular electronics. We have investigated the interplay with the underlying semiconductor substrate SiC leading to a patented concept for efficient transistors and circuits with epitaxial graphene (see "Graphene transistors in high-performance demonstration").



We will explore fundamental charge transport mechanisms in graphene, relying on the specific strengths of our material system, that is homogeneity, large-scale availability, and epitaxial control on the interface substrate-graphene.We will investigate low-temperature charge transport, where we will characterize the electron-electron-interaction corrections. By means of a refined data analysis, we will gain sensitivity to Kondo effect, which may allow to find a Kondo system. By controlled addition…

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Wir werden Experimente durchführen, in denen wir das Zusammenspiel von Graphen und organischen Molekülen mit elektrischen Methoden messen können. Wir beabsichtigen Einzelmolekülkontakte und flächige Graphen-Molekül-Graphen-Kontakte herzustellen, deren elektrische Transporteigenschaften wir detailliert untersuchen. Als Moleküle werden Polyyn-Drähte und andere molekulare Drähte verwendet. Weiterhin sind Moleküle mit Fulleren-Endgruppen von besonderem…

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Contributing researches