Next-generation crossover-free quantum Hall arrays with superconducting interconnections

Kruskopf, Mattias; Rigosi, Albert F.; Panna, Alireza R.; Marzano, Martina; Patel, Dinesh K.; Jin, Huiqing; Newell, David B.; Elmquist, Randolph E.

doi:10.1088/1681-7575/ab3ba3

Cited by 32 publications

(19 citation statements)

References 48 publications

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“…Furthermore, the array elements use superconducting interconnections that do not have ohmic resistance and do not suffer from magnetoresistance. This allows the potential contacts to be directly connected to the current path, making the QHARS as precise and stable as single-element quantized Hall resistance standards [5]. Exploiting the superconducting interconnections, this kind of device differs from a conventional one for being crossover free.…”

Section: Bridge-on-a-chip Description and Characterizationmentioning

confidence: 99%

“…In [3] we introduced the design of a direct current (DC) quantum Hall Kelvin bridge for the direct calibration of standard resistors. Here we present a bridge-on-a-chip implementation: the core is an integrated circuit composed of three quantum Hall effect (QHE) elements fabricated using epitaxial graphene on a SiC substrate and interconnected by a NbTiN superconducting wiring layer [4,5]. Each QHE element of the chip constitutes an arm of a Kelvin bridge; the fourth arm is given by the resistor under calibration.…”

Section: Introductionmentioning

confidence: 99%

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Implementation of a graphene quantum Hall Kelvin bridge-on-a-chip for resistance calibrations

et al. 2020

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The unique properties of the quantum Hall effect allow one to revisit traditional measurement circuits with a new flavour. In this paper we present the first realization of a quantum Hall Kelvin bridge for the calibration of standard resistors directly against the quantum Hall resistance. The bridge design is particularly simple and requires a minimal number of instruments. The implementation here proposed is based on the bridge-on-a-chip, an integrated circuit composed of three graphene quantum Hall elements and superconducting wiring. The accuracy achieved in the calibration of a 12 906 Ω standard resistor is of a few parts in 10 8 , at present mainly limited by the prototype device and the interferences in the current implementation, with the potential to achieve few parts in 10 9 , which is the level of the systematic uncertainty of the quantum Hall Kelvin bridge itself.

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Section: Bridge-on-a-chip Description and Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Implementation of a graphene quantum Hall Kelvin bridge-on-a-chip for resistance calibrations

et al. 2020

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“…Joining graphene QHE and the QHARS principle [41,42,43] can be the next step to achieve simple, reliable, economic and easy to operate quantum resistance standards suitable for operation in an industrial calibration center.…”

Section: Quantum Hall Resistance Standardsmentioning

confidence: 99%

A quantum ampere

Callegaro

2020

Tm - Technisches Messen

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The revision of the International System of Units (SI), implemented since 20 May 2019, has redefined the unit of electric current, the ampere ( A), linking it to a fixed value of the elementary charge. This paper discusses the new definition and the realisation of the electrical units by quantum electrical metrology standards, which every year become more and more accessible, reliable and user friendly.

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“…Resistance scaling to artifact standards at the highest precision requires cryogenic ratio bridges, so access to a broad and useful spectrum of traceable resistance measurements is out of reach for many laboratories. This has raised the interest in constructing accessible quantum-based resistance standards using arrays of semiconductor QHE devices [ 3 – 7 ], and in the case of epitaxial graphene (EG), using arrays [ 8 , 9 ] or devices with multiple regions of opposite charge separated by sharp p - n junctions [ 10 – 12 ].…”

Section: Introductionmentioning

confidence: 99%

Graphene quantum Hall effect parallel resistance arrays

Panna

Kruskopf

et al. 2021

Phys. Rev. B

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As first recognized in 2010, epitaxial graphene on SiC(0001) provides a platform for quantized Hall resistance (QHR) metrology unmatched by other two-dimensional structures and materials. Here we report graphene parallel QHR arrays, with metrologically precise quantization near 1000 Ω. These arrays have tunable carrier densities, due to uniform epitaxial growth and chemical functionalization, allowing quantization at the robust ν = 2 filling factor in array devices at relative precision better than 10 −8 . Broad tunability of the carrier density also enables investigation of the ν = 6 plateau. Optimized networks of QHR devices described in this work suppress Ohmic contact resistance error using branched contacts and avoid crossover leakage with interconnections that are superconducting for quantizing magnetic fields up to 13.5 T. Our work enables more direct scaling of resistance for quantized values in arrays of arbitrary network geometry.

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Next-generation crossover-free quantum Hall arrays with superconducting interconnections

Cited by 32 publications

References 48 publications

Implementation of a graphene quantum Hall Kelvin bridge-on-a-chip for resistance calibrations

Implementation of a graphene quantum Hall Kelvin bridge-on-a-chip for resistance calibrations

A quantum ampere

Graphene quantum Hall effect parallel resistance arrays

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