Abstract
Bottom-up synthesized graphene nanoribbons (GNRs) are precise quantum materials, offering a high degree of tunability of their physical properties. While field-effect transistors and single quantum dot (QD) devices have been reported, the fabrication of double QD devices using GNRs remains challenging due to their nanometer-scale dimensions. In this study, we present a multi-gate double QD device based on atomically precise GNRs that are contacted by a pair of single-walled carbon nanotube electrodes. At low temperatures, the device can be tuned with multiple gates and reveals triangular features characteristic for charge transport through a double QD system. From these features, the QD level spacing, as well as the interdot tunnel coupling and lead-dot tunnel couplings are extracted. Double QD systems serve as essential building blocks for developing different types of qubits based on atomically precise GNRs. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000638254Publication status
publishedExternal links
Journal / series
Materials for Quantum TechnologyVolume
Pages / Article No.
Publisher
IOP PublishingSubject
graphene nanoribbons; double quantum dots; carbon nanotubes; bias triangles; excited statesOrganisational unit
09782 - Perrin, Mickaël / Perrin, Mickaël
Funding
203663 - Three-terminal particle-exchange heat engines for efficient energy conversion at the nanoscale (SNF)
881603 - Graphene Flagship Core Project 3 (EC)
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