TY  - JOUR
AU  - Neumann, C.
AU  - Volk, C.
AU  - Engels, S.
AU  - Stampfer, C.
TI  - Graphene-based charge sensors
JO  - Nanotechnology
VL  - 24
IS  - 44
SN  - 1361-6528
CY  - Bristol
PB  - IOP Publ.
M1  - FZJ-2015-02798
SP  - 444001 -
PY  - 2013
AB  - We discuss graphene nanoribbon-based charge sensors and focus on their functionality in the presence of external magnetic fields and high frequency pulses applied to a nearby gate electrode. The charge detectors work well with in-plane magnetic fields of up to 7 T and pulse frequencies of up to 20 MHz. By analyzing the step height in the charge detector's current at individual charging events in a nearby quantum dot, we determine the ideal operation conditions with respect to the applied charge detector bias. Average charge sensitivities of 1.3 × 10−3e Hz−1/2 can be achieved. Additionally, we investigate the back action of the charge detector current on the quantum transport through a nearby quantum dot. By varying the charge detector bias from 0 to 4.5 mV, we can increase the Coulomb peak currents measured at the quantum dot by a factor of around 400. Furthermore, we can completely lift the Coulomb blockade in the quantum dot.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000326015600004
C6  - pmid:24113720
DO  - DOI:10.1088/0957-4484/24/44/444001
UR  - https://juser.fz-juelich.de/record/189768
ER  -