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- Title
Ballistic bipolar junctions in chemically gated graphene ribbons.
- Authors
Baringhaus, Jens; Tegenkamp, Christoph; Stöhr, Alexander; Forti, Stiven; Starke, Ulrich
- Abstract
The realization of ballistic graphene pn-junctions is an essential task in order to study Klein tunneling phenomena. Here we show that intercalation of Ge under the buffer layer of pre-structured SiC-samples succeeds to make truly nano-scaled pn-junctions. By means of local tunneling spectroscopy the junction width is found to be as narrow as 5 nm which is a hundred times smaller compared to electrically gated structures. The ballistic transmission across the junction is directly proven by systematic transport measurements with a 4-tip STM. Various npn- and pnp-junctions are studied with respect to the barrier length. The pn-junctions are shown to act as polarizer and analyzer with the second junction becoming transparent in case of a fully ballistic barrier. This can be attributed to the almost full suppression of electron transmission through the junction away from normal incidence.
- Subjects
GRAPHENE; KLEIN paradox; P-N junctions (Semiconductors); TUNNELING spectroscopy; ELECTRON transport
- Publication
Scientific Reports, 2015, p9955
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/srep09955