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A graphene quantum dot with a single electron transistor as an integrated charge sensor

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10 Author(s)
Wang, Lin-Jun ; Key Laboratory of Quantum Information, Chinese Academy of Sciences, University of Science and Technology of China, Hefei 230026, People’s Republic of China ; Cao, Gang ; Tu, Tao ; Li, Hai-Ou
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A quantum dot (QD) with an integrated charge sensor is becoming a common architecture for a spin or charge based solid state qubit. To implement such a structure in graphene, we have fabricated a twin-dot structure in which the larger dot serves as a single electron transistor (SET) to read out the charge state of the nearby gate controlled small QD. A high SET sensitivity of

10-3e/
 Hz
allowed us to probe Coulomb charging as well as excited state spectra of the QD, even in the regime where the current through the QD is too small to be measured by conventional transport means.

Published in:

Applied Physics Letters  (Volume:97 ,  Issue: 26 )

Date of Publication:

Dec 2010

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