Mini array of quantum Hall devices based on epitaxial graphene
Tutkimustuotos: Lehtiartikkeli › › vertaisarvioitu
- VTT MIKES Metrology
- VTT Technical Research Centre of Finland
Series connection of four quantum Hall effect (QHE) devices based on epitaxial graphene films was studied for realization of a quantum resistance standard with an up-scaled value. The tested devices showed quantum Hall plateaux RH,2 at a filling factor v = 2 starting from a relatively low magnetic field (between 4 T and 5 T) when the temperature was 1.5 K. The precision measurements of quantized Hall resistance of four QHE devices connected by triple series connections and external bonding wires were done at B = 7 T and T = 1.5 K using a commercial precision resistance bridge with 50 μA current through the QHE device. The results showed that the deviation of the quantized Hall resistance of the series connection of four graphene-based QHE devices from the expected value of 4×RH,2 = 2 h/e2 was smaller than the relative standard uncertainty of the measurement (-7) limited by the used resistance bridge.
|Julkaisu||Journal of Applied Physics|
|Tila||Julkaistu - 7 toukokuuta 2016|
|OKM-julkaisutyyppi||A1 Julkaistu artikkeli, soviteltu|