• 文献标题:   Graphene Devices for Tabletop and High-Current Quantized Hall Resistance Standards
  • 文献类型:   Article
  • 作  者:   RIGOSI AF, PANNA AR, PAYAGALA SU, KRUSKOPF M, KRAFT ME, JONES GR, WU BY, LEE HY, YANG YF, HU JN, JARRETT DG, NEWELL DB, ELMQUIST RE
  • 作者关键词:   binary cryogenic current comparator bccc, direct current comparator dcc, epitaxial graphene eg, metrology, quantized hall resistance qhr, standard resistor, standards calibration
  • 出版物名称:   IEEE TRANSACTIONS ON INSTRUMENTATION MEASUREMENT
  • ISSN:   0018-9456 EI 1557-9662
  • 通讯作者地址:   NIST
  • 被引频次:   12
  • DOI:   10.1109/TIM.2018.2882958
  • 出版年:   2019

▎ 摘  要

We report the performance of a quantum Hall resistance standard based on epitaxial graphene maintained in a 5-T tabletop cryocooler system. This quantum resistance standard requires no liquid helium and can operate continuously, allowing year-round accessibility to quantized Hall resistance measurements. The nu = 2 plateau, with a value of R-K/2, also seen as RH, is used to scale to 1 k Omega using a binary cryogenic current comparator (BCCC) bridge and a direct current comparator (DCC) bridge. The uncertainties achieved with the BCCC are such as those obtained in the state-of-the-art measurements using GaAs-based devices. BCCC scaling methods can achieve large resistance ratios of 100 or more, and while room temperature DCC bridges have smaller ratios and lower current sensitivity, they can still provide alternate resistance scaling paths without the need for cryogens and superconducting electronics. Estimates of the relative uncertainties of the possible scaling methods are provided in this report, along with a discussion of the advantages of several scaling paths. The tabletop system limits are addressed as are potential solutions for using graphene standards at higher currents.