2013/08/13 by D. Bischoff, Dominik Bischoff, Anastasia Varlet +4 · 22 citations
Engineering · Materials Science · Physics and Astronomy · #Bilayer #Bilayer graphene #Charge (physics) #Condensed matter physics #Coulomb #Coulomb blockade #Electron #Geometry #Graphene #Graphene research and applications #Molecular Junctions and Nanostructures #Physics #Quantum #Quantum and electron transport phenomena #Quantum dot #Quantum mechanics #Symmetry (geometry) #Voltage #cond-mat.mes-hall
paper · pdf · doi:10.1088/1367-2630/15/8/083029
published in New Journal of Physics 15(8), 083029 (IOP Publishing)
openalex publication_date 2013/08/13 · arxiv created 2014/06/20 · arxiv updated 2014/06/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
A quantum dot has been etched in bilayer graphene connected by two small constrictions to the leads. We show that this structure does not behave like a single quantum dot but consists of at least three sites of localized charge in series. The high symmetry and electrical stability of the device allowed us to triangulate the positions of the different sites of localized charge and find that one site is located in the island and one in each of the constrictions. Nevertheless we measure many consecutive non-overlapping Coulomb-diamonds in series. In order to describe these findings, we treat the system as a strongly coupled serial triple quantum dot. We find that the non-overlapping Coulomb diamonds arise due to higher order cotunneling through the outer dots located in the constrictions. We extract all relevant capacitances, simulate the measured data with a capacitance model and discuss its implications on electrical transport.