Unknown

Dataset Information

0

Ballistic bipolar junctions in chemically gated graphene ribbons.


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.

SUBMITTER: Baringhaus J 

PROVIDER: S-EPMC4404713 | biostudies-literature | 2015

REPOSITORIES: biostudies-literature

altmetric image

Publications

Ballistic bipolar junctions in chemically gated graphene ribbons.

Baringhaus Jens J   Stöhr Alexander A   Forti Stiven S   Starke Ulrich U   Tegenkamp Christoph C  

Scientific reports 20150421


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 syste  ...[more]

Similar Datasets

| S-EPMC4317505 | biostudies-literature
| S-EPMC5474691 | biostudies-literature
| S-EPMC4832184 | biostudies-other
| S-EPMC6172216 | biostudies-literature
| S-EPMC6200825 | biostudies-other
| S-EPMC6704170 | biostudies-literature
| S-EPMC4840339 | biostudies-literature
| S-EPMC4895026 | biostudies-literature
| S-EPMC3650657 | biostudies-literature
| S-EPMC5928051 | biostudies-literature