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arXiv · 2306.12765

Josephson diode effect in monolithic dc-SQUIDs based on 3D Dayem nanobridges

Angelo Greco·Quentin Pichard·Francesco Giazotto
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Abstract

It was recently experimentally proved that the superconducting counterpart of a diode, i.e., a device that realizes nonreciprocal Cooper pairs transport, can be realized by breaking the spatial and time-reversal symmetry of a system simultaneously. Here we report the theory, fabrication, and operation of a monolithic dc superconducting quantum interference device (dc-SQUID) that embedding three-dimensional (3D) Dayem nanobridges as weak links realizes an efficient and magnetic flux-tunable supercurrent diode. The device is entirely realized in Al and achieves a maximum rectification efficiency of $\sim 20\%$, which stems from the high harmonic content of its current-to-phase relation only without the need of any sizable screening current caused by a finite loop inductance. Our interferometer can be easily integrated with state-of-the-art superconducting electronics, and since it does not require a finite loop inductance to provide large rectification its downsizing is not limited by the geometrical constraints of the superconducting ring.

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Angelo Greco, Quentin Pichard, Francesco Giazotto. 2023-06-22. Josephson diode effect in monolithic dc-SQUIDs based on 3D Dayem nanobridges. https://doi.org/10.1063/5.0165259

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