Charge Detection in Graphene Quantum Dots

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dc.creatorGuettinger, J.
dc.creatorStampfer, C.
dc.creatorHellmueller, S.
dc.creatorMolitor, F.
dc.creatorIhn, T.
dc.creatorEnsslin, K.
dc.date2008-09-23
dc.date.accessioned2026-07-07T10:20:26Z
dc.date.available2026-07-07T10:20:26Z
dc.descriptionWe report measurements on a graphene quantum dot with an integrated graphene charge detector. The quantum dot device consists of a graphene island (diameter approx. 200 nm) connected to source and drain contacts via two narrow graphene constrictions. From Coulomb diamond measurements a charging energy of 4.3 meV is extracted. The charge detector is based on a 45 nm wide graphene nanoribbon placed approx. 60 nm from the island. We show that resonances in the nanoribbon can be used to detect individual charging events on the quantum dot. The charging induced potential change on the quantum dot causes a step-like change of the current in the charge detector. The relative change of the current ranges from 10% up to 60% for detecting individual charging events.
dc.description4 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/0809.3904
dc.identifierhttp://arxiv.org/abs/0809.3904
dc.identifierApplied Physics Letters 93, 212102 (2008)
dc.identifierdoi:10.1063/1.3036419
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/174847
dc.subjectMesoscale and Nanoscale Physics
dc.titleCharge Detection in Graphene Quantum Dots
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