Mini array of quantum Hall devices based on epitaxial graphene

Tutkimustuotos: Lehtiartikkelivertaisarvioitu

Tutkijat

  • S. Novikov
  • N. Lebedeva
  • J. Hämäläinen
  • I. Iisakka
  • P. Immonen
  • A. J. Manninen
  • A. Satrapinski

Organisaatiot

  • VTT MIKES Metrology
  • VTT Technical Research Centre of Finland

Kuvaus

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.

Yksityiskohdat

AlkuperäiskieliEnglanti
Artikkeli174504
Sivumäärä6
JulkaisuJournal of Applied Physics
Vuosikerta119
Numero17
TilaJulkaistu - 7 toukokuuta 2016
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

ID: 4852402