Details

Autor(en) / Beteiligte

• Rigosi, Albert F.
• Panna, Alireza R.
• Payagala, Shamith U.
• Kruskopf, Mattias
• Kraft, Marlin E.
• Jones, George R.
• Wu, Bi-Yi
• Lee, Hsin-Yen
• Yang, Yanfei
• Hu, Jiuning
• Jarrett, Dean G.
• Newell, David B.
• Elmquist, Randolph E.

Titel

Graphene Devices for Tabletop and High-Current Quantized Hall Resistance Standards

Ist Teil von

• IEEE transactions on instrumentation and measurement, 2019-06, Vol.68 (6), p.1870-1878

Ort / Verlag

United States: IEEE

Erscheinungsjahr

2019

Quelle

IEEE/IET Electronic Library (IEL)

Beschreibungen/Notizen

• 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 <inline-formula> <tex-math notation="LaTeX">\nu = 2 </tex-math></inline-formula> plateau, with a value of <inline-formula> <tex-math notation="LaTeX">R_{\mathrm {K}} </tex-math></inline-formula>/2, also seen as <inline-formula> <tex-math notation="LaTeX">R_{\mathrm {H}} </tex-math></inline-formula>, is used to scale to 1 <inline-formula> <tex-math notation="LaTeX">\text{k}\Omega </tex-math></inline-formula> 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.