Gate-tunable Josephson diode effect in Rashba spin-orbit coupled quantum dot junctions

Debnath, Debika; Dutta, Paramita

doi:10.1103/physrevb.109.174511

Phys. Rev. B

2024

DOI: 10.1103/physrevb.109.174511

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Gate-tunable Josephson diode effect in Rashba spin-orbit coupled quantum dot junctions

Debika Debnath,

Paramita Dutta

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2024

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Cited by 11 publications

References 74 publications

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Double loop dc-SQUID as a tunable Josephson diode

Greco,

Pichard,

Strambini

et al. 2024

Applied Physics Letters

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The development of superconducting electronics requires careful characterization of the components that makeup electronic circuits. Superconducting weak links are the building blocks of most superconducting electronic components and are characterized by highly nonlinear current-to-phase relations (CPRs), which are often not perfectly known. Recent research has found that the Josephson diode effect (JDE) can be related to the high harmonic content of the current-to-phase relation of the weak links embedded in superconducting interferometers. This makes the JDE a natural tool for exploring the harmonic content of weak links beyond single-harmonic CPR. In this study, we present the theoretical model and experimental characterization of a double-loop superconducting quantum interference device (DL-SQUID) that embeds all-metallic superconductor-normal metal-superconductor junctions. The proposed device exhibits the JDE due to the interference of the supercurrents of three weak links in parallel, and this feature can be adjusted through two magnetic fluxes, which act as experimental knobs. We carry out a theoretical study of the device in terms of the relative weight of the interferometer arms and the experimental characterization concerning flux tunability and temperature.

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Double loop dc-SQUID as a tunable Josephson diode

Greco,

Pichard,

Strambini

et al. 2024

Applied Physics Letters

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Quasiparticles-mediated thermal diode effect in Weyl Josephson junctions

Chatterjee,

Dutta

2024

New J. Phys.

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We theoretically show quasiparticles-driven thermal diode eﬀect (TDE) in an inversion symmetrybroken (ISB) Weyl superconductor (WSC)-Weyl semimetal (WSM)-WSC Josephson junction. A Zeeman ﬁeld perpendicular to the WSM region of the thermally-biased Weyl Josephson junction (WJJ) induces an asymmetry between the forward and reverse thermal currents, which is responsible for the TDE. Most interestingly, we show that the sign and magnitude of the thermal diode rectiﬁcation coeﬃcient is highly tunable by the superconducting phase diﬀerence and external Zeeman ﬁeld, and also strongly depends on the junction length. The tunability of the rectiﬁcation, particularly, the sign changing behavior associated with higher rectiﬁcation enhances the potential of our WJJ thermal diode to use as functional switching components in thermal devices.

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Altermagnetic superconducting diode effect

Banerjee,

Scheurer

2024

Phys. Rev. B

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Gate-tunable Josephson diode effect in Rashba spin-orbit coupled quantum dot junctions

Cited by 11 publications

References 74 publications

Double loop dc-SQUID as a tunable Josephson diode

Double loop dc-SQUID as a tunable Josephson diode

Quasiparticles-mediated thermal diode effect in Weyl Josephson junctions

Altermagnetic superconducting diode effect

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