rf-SQUID measurements of anomalous Josephson effect

We discuss the response of an rf-SQUID formed by anomalous Josephson junctions embedded in a superconducting ring with a non-negligible inductance. We demonstrate that a properly sweeping in-plane magnetic field can cause both the total flux and the current circulating in the device to modulate and...

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Main Authors: C. Guarcello, R. Citro, O. Durante, F. S. Bergeret, A. Iorio, C. Sanz-Fernández, E. Strambini, F. Giazotto, A. Braggio
Format: Article
Language:English
Published: American Physical Society 2020-05-01
Series:Physical Review Research
Online Access:http://doi.org/10.1103/PhysRevResearch.2.023165
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author C. Guarcello
R. Citro
O. Durante
F. S. Bergeret
A. Iorio
C. Sanz-Fernández
E. Strambini
F. Giazotto
A. Braggio
author_facet C. Guarcello
R. Citro
O. Durante
F. S. Bergeret
A. Iorio
C. Sanz-Fernández
E. Strambini
F. Giazotto
A. Braggio
author_sort C. Guarcello
collection DOAJ
description We discuss the response of an rf-SQUID formed by anomalous Josephson junctions embedded in a superconducting ring with a non-negligible inductance. We demonstrate that a properly sweeping in-plane magnetic field can cause both the total flux and the current circulating in the device to modulate and to behave hysteretically. The bistable response of the system is analyzed as a function of the anomalous phase shift at different values of the screening parameter, in order to highlight the parameter range within which a hysteretic behavior can be observed. The magnetic flux piercing the SQUID ring is demonstrated to further modulate the hysteretical response of the system. Moreover, we show that the anomalous phase shift can be conveniently determined through the measurement of the out-of-plane magnetic field at which the device switches to the voltage state and the number of trapped flux quanta changes. Finally, we compare the response of two different device configurations, namely, a SQUID including only one or two anomalous junctions. In view of these results, the proposed device can be effectively used to detect and measure the anomalous Josephson effect.
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spelling doaj.art-839bf651ce0341d6bc608f1ce92589ab2024-04-12T16:53:56ZengAmerican Physical SocietyPhysical Review Research2643-15642020-05-012202316510.1103/PhysRevResearch.2.023165rf-SQUID measurements of anomalous Josephson effectC. GuarcelloR. CitroO. DuranteF. S. BergeretA. IorioC. Sanz-FernándezE. StrambiniF. GiazottoA. BraggioWe discuss the response of an rf-SQUID formed by anomalous Josephson junctions embedded in a superconducting ring with a non-negligible inductance. We demonstrate that a properly sweeping in-plane magnetic field can cause both the total flux and the current circulating in the device to modulate and to behave hysteretically. The bistable response of the system is analyzed as a function of the anomalous phase shift at different values of the screening parameter, in order to highlight the parameter range within which a hysteretic behavior can be observed. The magnetic flux piercing the SQUID ring is demonstrated to further modulate the hysteretical response of the system. Moreover, we show that the anomalous phase shift can be conveniently determined through the measurement of the out-of-plane magnetic field at which the device switches to the voltage state and the number of trapped flux quanta changes. Finally, we compare the response of two different device configurations, namely, a SQUID including only one or two anomalous junctions. In view of these results, the proposed device can be effectively used to detect and measure the anomalous Josephson effect.http://doi.org/10.1103/PhysRevResearch.2.023165
spellingShingle C. Guarcello
R. Citro
O. Durante
F. S. Bergeret
A. Iorio
C. Sanz-Fernández
E. Strambini
F. Giazotto
A. Braggio
rf-SQUID measurements of anomalous Josephson effect
Physical Review Research
title rf-SQUID measurements of anomalous Josephson effect
title_full rf-SQUID measurements of anomalous Josephson effect
title_fullStr rf-SQUID measurements of anomalous Josephson effect
title_full_unstemmed rf-SQUID measurements of anomalous Josephson effect
title_short rf-SQUID measurements of anomalous Josephson effect
title_sort rf squid measurements of anomalous josephson effect
url http://doi.org/10.1103/PhysRevResearch.2.023165
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