TY  - JOUR
AU  - Banszerus, Luca
AU  - Möller, Samuel
AU  - Icking, Eike
AU  - Watanabe, Kenji
AU  - Taniguchi, Takashi
AU  - Volk, Christian
AU  - Stampfer, Christoph
TI  - Single-Electron Double Quantum Dots in Bilayer Graphene
JO  - Nano letters
VL  - 20
IS  - 3
SN  - 1530-6992
CY  - Washington, DC
PB  - ACS Publ.
M1  - FZJ-2020-02154
SP  - 2005 - 2011
PY  - 2020
AB  - We present transport measurements through an electrostatically defined bilayer graphene double quantum dot in the single-electron regime. With the help of a back gate, two split gates, and two finger gates, we are able to control the number of charge carriers on two gate-defined quantum dots independently between zero and five. The high tunability of the device meets requirements to make such a device a suitable building block for spin-qubits. In the single-electron regime, we determine interdot tunnel rates on the order of 2 GHz. Both, the interdot tunnel coupling as well as the capacitive interdot coupling increase with dot occupation, leading to the transition to a single quantum dot. Finite bias magneto-spectroscopy measurements allow to resolve the excited-state spectra of the first electrons in the double quantum dot and are in agreement with spin and valley conserving interdot tunneling processes.
LB  - PUB:(DE-HGF)16
C6  - pmid:32083885
UR  - <Go to ISI:>//WOS:000526408800068
DO  - DOI:10.1021/acs.nanolett.9b05295
UR  - https://juser.fz-juelich.de/record/877347
ER  -