Charge Detection in Gate-Defined Bilayer Graphene Quantum Dots.
Nano Lett
; 19(8): 5216-5221, 2019 Aug 14.
Article
en En
| MEDLINE
| ID: mdl-31311270
ABSTRACT
We report on charge detection in electrostatically defined quantum dot devices in bilayer graphene using an integrated charge detector. The device is fabricated without any etching and features a graphite back gate, leading to high-quality quantum dots. The charge detector is based on a second quantum dot separated from the first dot by depletion underneath a 150 nm wide gate. We show that Coulomb resonances in the sensing dot are sensitive to individual charging events on the nearby quantum dot. The potential change due to single electron charging causes a steplike change (up to 77%) in the current through the charge detector. Furthermore, the charging states of a quantum dot with tunable tunneling barriers and of coupled quantum dots can be detected.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Tipo de estudio:
Diagnostic_studies
Idioma:
En
Revista:
Nano Lett
Año:
2019
Tipo del documento:
Article
País de afiliación:
Suiza