Fabrication of coupled graphene-nanotube quantum devices
| Autor: | S Engels, P Weber, B Terrés, J Dauber, C Meyer, C Volk, S Trellenkamp, U Wichmann, C Stampfer |
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| Rok vydání: | 2012 |
| Předmět: |
Physics
Nanotube business.industry Graphene Mechanical Engineering Physics::Optics Coulomb blockade Bioengineering General Chemistry Chemical vapor deposition Carbon nanotube Condensed Matter::Mesoscopic Systems and Quantum Hall Effect law.invention Carbon nanotube quantum dot Condensed Matter::Materials Science Mechanics of Materials law Quantum dot Physics::Atomic and Molecular Clusters Optoelectronics General Materials Science Physics::Chemical Physics Electrical and Electronic Engineering business Quantum tunnelling |
| Zdroj: | Nanotechnology. 24(3) |
| ISSN: | 1361-6528 |
| Popis: | We report on the fabrication and characterization of all-carbon hybrid quantum devices based on graphene and single-walled carbon nanotubes. We discuss both carbon nanotube quantum dot devices with graphene charge detectors and nanotube quantum dots with graphene leads. The devices are fabricated by chemical vapor deposition growth of carbon nanotubes and subsequent structuring of mechanically exfoliated graphene. We study the detection of individual charging events in the carbon nanotube quantum dot by a nearby graphene nanoribbon and show that they lead to changes of up to 20% of the conductance maxima in the graphene nanoribbon, acting as a well performing charge detector. Moreover, we discuss an electrically coupled graphene-nanotube junction, which exhibits a tunneling barrier with tunneling rates in the low GHz regime. This allows us to observe Coulomb blockade on a carbon nanotube quantum dot with graphene source and drain leads. |
| Databáze: | OpenAIRE |
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