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 ohm 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.

Implementation of a graphene quantum Hall Kelvin bridge-on-a-chip for resistance calibrations / Marzano, Martina; Kruskopf, Mattias; Panna, Alireza R; Rigosi, Albert F; Patel, Dinesh K; Jin, Hanbyul; Cular, Stefan; Callegaro, Luca; Elmquist, Randolph E; Ortolano, Massimo. - In: METROLOGIA. - ISSN 0026-1394. - 57:1(2020), p. 015007. [10.1088/1681-7575/ab581e]

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

Marzano, Martina
;
Callegaro, Luca;
2020

Abstract

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 ohm 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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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11696/61071
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