Single electron charging in parallel coupled quantum dots

We report low-temperature conductance measurements in the Coulomb blockade regime on two nominally identical tunnel-coupled quantum dots in parallel defined electrostatically in the two-dimensional electron gas of a GaAs/AlGaAs heterostructure. At low interdot tunnel coupling we find that the conduc...

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Bibliographic Details
Published in:Superlattices and microstructures 1996-01, Vol.20 (3), p.411-417
Main Authors: Adourian, A.S., Livermore, C., Westervelt, R.M., Campman, K.L., Gossard, A.C.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Coulomb blockade
single-electron tunneling
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronic transport in mesoscopic systems
Exact sciences and technology
Physics
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Summary:We report low-temperature conductance measurements in the Coulomb blockade regime on two nominally identical tunnel-coupled quantum dots in parallel defined electrostatically in the two-dimensional electron gas of a GaAs/AlGaAs heterostructure. At low interdot tunnel coupling we find that the conductance measured through one dot is sensitive to the charge state of the neighboring dot. At larger interdot coupling the conductance data reflect the role of quantum charge fluctuations between the dots. As the interdot conductance approaches 2 e 2/ h, the coupled dots behave as a single large dot.
ISSN:0749-6036
1096-3677
DOI:10.1006/spmi.1996.0097