Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session L33: Quantum Devices and 2D Materials
11:15 AM–2:03 PM,
Wednesday, March 6, 2019
BCEC
Room: 204B
Sponsoring
Unit:
FIAP
Chair: Eui-Hyeok Yang
Abstract: L33.00006 : Large-area graphene quantized Hall resistance arrays using superconducting interconnections
12:15 PM–12:27 PM
Presenter:
Mattias Kruskopf
(Quantum Measurement Division, National Institute of Standards and Technology)
Authors:
Mattias Kruskopf
(Quantum Measurement Division, National Institute of Standards and Technology)
Albert Rigosi
(Quantum Measurement Division, National Institute of Standards and Technology)
Hanbyul Jin
(Quantum Measurement Division, National Institute of Standards and Technology)
Dinesh Patel
(Quantum Measurement Division, National Institute of Standards and Technology)
Shamith Payagala
(Quantum Measurement Division, National Institute of Standards and Technology)
Alireza Panna
(Quantum Measurement Division, National Institute of Standards and Technology)
Dean G. Jarrett
(Quantum Measurement Division, National Institute of Standards and Technology)
David B Newell
(Quantum Measurement Division, National Institute of Standards and Technology)
Randolph E Elmquist
(Quantum Measurement Division, National Institute of Standards and Technology)
This work shows the first results of epitaxial graphene-based, QHR array devices using superconducting contacts and interconnections to minimize parasitic resistances. The applied contact design is optimized for reduced contact resistances and circumvents any possible alteration of the QHR caused by Andreev reflections. For homogenous charge carrier concentrations and high monolayer quality, optimized growth and doping techniques were developed to allow for the realization of complex chip designs on the centimeter scale.
The results show different QHR array devices at exceptionally high currents in the mA range that are utilized to improve the measurement uncertainty of relatively simple, room temperature resistance bridges. To ensure the applicability in quantum resistance metrology, we apply and test new global criteria of quantization and verify the precision using direct current comparators and cryogenic current comparator bridges.
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