AC and DC Quantized Hall Array Resistance Standards

Published

August 28, 2020

Author(s)

Randolph E. Elmquist, Mattias Kruskopf, Dinesh K. Patel, I Fan Hu, Chieh-I Liu, Albert F. Rigosi, Alireza R. Panna, Shamith U. Payagala, Dean G. Jarrett

Abstract

Quantized Hall array resistance standards (QHARS) span values from 100 (ohm) to 1 M(ohm) and demonstrate precision approaching that of single devices. This paper focuses on QHARS having values near 1 k(ohm) for increased sensitivity using room-temperature direct current comparator (DCC) bridges and digital impedance bridges. We introduce a dc QHARS design that uses the Wheatstone bridge principle as a precise test of the QHARS self-consistency for dc measurements. Branched contacts and superconducting interconnections help to reduce ac and dc loading and leakage errors with near-zero resistance at magnetic flux densities of 9 T.

Proceedings Title

2020 Conference on Precision Electromagnetic Measurements(CPEM 2020)

Conference Dates

August 24-28, 2020

Conference Location

Denver, CO

Pub Type

Conferences

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Keywords

electrical measurement standards, quantized Hall resistance, epitaxial graphene, Wheatstone bridge

Citation

Elmquist, R. , Kruskopf, M. , Patel, D. , Hu, I. , Liu, C. , Rigosi, A. , Panna, A. , Payagala, S. and Jarrett, D. (2020), AC and DC Quantized Hall Array Resistance Standards, 2020 Conference on Precision Electromagnetic Measurements(CPEM 2020), Denver, CO, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=929559 (Accessed February 5, 2025)