Towards a graphene-based quantum impedance standard

C.-C. Kalmbach, J. Schurr (Corresponding Author), F.J. Ahlers, A. Müller, S. Novikov, N. Lebedeva, Alexander Satrapinski

Research output: Contribution to journalArticleScientificpeer-review

26 Citations (Scopus)


Precision measurements of the quantum Hall resistance with alternating current (ac) in the kHz range were performed on epitaxial graphene in order to assess its suitability as a quantum standard of impedance. The quantum Hall plateaus measured with alternating current were found to be flat within one part in 107. This is much better than for plain GaAs quantum Hall devices and shows that the magnetic-flux-dependent capacitive ac losses of the graphene device are less critical. The observed frequency dependence of about -8?×?10-8/kHz is comparable in absolute value to the positive frequency dependence of plain GaAs devices, but the negative sign is attributed to stray capacitances which we believe can be minimized by a careful design of the graphene device. Further improvements thus may lead to a simpler and more user-friendly quantum standard for both resistance and impedance.
Original languageEnglish
Article number073511
Number of pages4
JournalApplied Physics Letters
Issue number7
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed


  • graphene
  • semiconductors
  • electrical resistivity
  • quantum measurement theory
  • alternating current


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