The superconducting diode effect in a device based on coupled Josephson junctions
Credit score: Matsuo et al.


The so-called superconducting (SC) diode impact is an attention-grabbing nonreciprocal phenomenon, occurring when a fabric is SC in a single path and resistive within the different. This impact has been the main target of quite a few physics research, as its remark and dependable management in several supplies may allow the longer term improvement of latest built-in circuits.

Researchers at RIKEN and different institutes in Japan and america just lately noticed the SC diode impact in a newly developed system comprised of two coherently coupled Josephson junctions. Their paper, revealed in Nature Physics, may information the engineering of promising applied sciences based mostly on coupled Josephson junctions.

“We experimentally studied nonlocal Josephson impact, which is a attribute SC transport within the coherently coupled Josephson junctions (JJs), impressed by a earlier theoretical paper revealed in NanoLetters,” Sadashige Matsuo, one of many researchers who carried out the examine, advised

“The current examine featured in Nature physics is an extension of our earlier work concerning the nonlocal Josephson impact. Due to this fact, we utilized the identical strategies utilized in our earlier paper.”


The current work by Matsuo and his colleague builds on their earlier analysis efforts specializing in SC transport in coherently coupled JJs. To conduct their experiments, the crew used a tool that consists in two JJs sharing a single SC lead.

“When the shared SC lead is slender, the 2 JJs are coherently coupled and work together with one another,” Matsuo defined. “By embedding one JJ into the SC loop and measuring the opposite JJ, we will examine the SC transport of the JJs affected by the opposite JJs via the coherent coupling.”

By modulating the part of the coupled JJs of their system, Matsuo and his colleagues had been finally in a position to produce the SC diode impact. Their work thus unveiled a promising and dependable technique to appreciate this impact in coupled JJs-based gadgets, whereas additionally shedding additional gentle on the physics underpinning the impact in these gadgets.

“The SC diode impact itself is vital as a result of the phenomenon will probably be utilized for dissipationless rectification in future SC circuits,” Matsuo stated. “Moreover, the SC diode impact emerges when SC gadgets would not have time-reversal and spatial-inversion symmetries. Due to this fact, our outcomes recommend that the part management of the coupled JJs can break such symmetries. Which means that the opposite unique SC phenomena anticipated with the symmetries damaged could also be realized within the coupled JJs.”

Sooner or later, this current paper may open new alternatives for the sector of electronics engineering. For example, the strategies they used might be utilized to the event of latest extremely performing superconducting digital parts. Concurrently, the work by Matsuo and his colleagues may encourage different analysis groups worldwide to hold out comparable research utilizing coupled JJs.

“We now plan to hunt unique SC phenomena apart from the SC diode impact by controlling the coherent coupling of the JJs,” Matsuo added.

Extra data:
Sadashige Matsuo et al, Josephson diode impact derived from short-range coherent coupling, Nature Physics (2023). DOI: 10.1038/s41567-023-02144-x

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