Edge channel confinement in a bilayer graphene n-p-n quantum dot

We combine electrostatic and magnetic confinement to define a quantum dot in bilayer graphene. The employed geometry couples n-doped reservoirs to a p-doped dot. At magnetic field values around B = 2 T, Coulomb blockade is observed. This demonstrates that the coupling of the copropagating modes at t...

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Bibliographic Details
Published in:New journal of physics 2018-01, Vol.20 (1), p.13013
Main Authors: Overweg, Hiske, Rickhaus, Peter, Eich, Marius, Lee, Yongjin, Pisoni, Riccardo, Watanabe, Kenji, Taniguchi, Takashi, Ihn, Thomas, Ensslin, Klaus
Format: Article
Language:English
Subjects:
bilayer graphene
Bilayers
Charge transport
Confinement
Current carriers
Electrons
Graphene
junction
Physics
p–n junction
quantum dot
Quantum dots
quantum Hall edge channels
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Summary:We combine electrostatic and magnetic confinement to define a quantum dot in bilayer graphene. The employed geometry couples n-doped reservoirs to a p-doped dot. At magnetic field values around B = 2 T, Coulomb blockade is observed. This demonstrates that the coupling of the copropagating modes at the p-n interface is weak enough to form a tunnel barrier, facilitating transport of single charge carriers onto the dot. This result may be of use for quantum Hall interferometry experiments.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/aa9cd3