Journal Article

FZJ-2015-02798

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Graphene-based charge sensors

Neumann, C. (Corresponding Author)FZJ* ; Volk, C.FZJ* ; Engels, S.FZJ* ; Stampfer, C.FZJ*

2013
IOP Publ. Bristol

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Please use a persistent id in citations: doi:10.1088/0957-4484/24/44/444001

Abstract: 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.

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Contributing Institute(s):

1. Halbleiter-Nanoelektronik (PGI-9)
2. JARA-FIT (JARA-FIT)

Research Program(s):

1. 421 - Frontiers of charge based Electronics (POF2-421) (POF2-421)

Appears in the scientific report 2014

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Database coverage:
; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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