期刊
APPLIED PHYSICS LETTERS
卷 93, 期 21, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3036419
关键词
carbon; interface states; nanostructured materials; quantum dots
资金
- ETH FIRST Laboratory
- Swiss National Science Foundation
- NCCR
We report measurements on a graphene quantum dot with an integrated graphene charge detector. The quantum dot device consists of a graphene island (diameter of similar to 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 approximately 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 steplike change in the current in the charge detector. The relative change in the current ranges from 10% up to 60% for detecting individual charging events.
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