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Superlederdiode; Josephson-diode - slags envejssuperleder

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#1  02/04-23 08:39
Glenn Møller-Holst
Indlæg: 731
Superlederdiode; Josephson-diode - slags envejssuperleder; tæt på ideel diodemodtager diode? Nogen andre forslag til anvendelse?

April 27, 2022, Breakthrough Discovery of the One-Way Superconductor – Thought To Be Impossible:
https://scitechdaily.com/breakthrough-discovery- of-the-one-way-superconductor-thought-to -be-impossible/
Citat: "...
Q: How did you manage to do what first seemed impossible?

Ali: “It was really the result of one of my group’s fundamental research directions. In what we call “Quantum Material Josephson Junctions” (QMJJs), we replace the classical barrier material in JJs with a quantum material barrier, where the quantum material’s intrinsic properties can modulate the coupling between the two superconductors in novel ways. The Josephson Diode was an example of this: we used the quantum material Nb3Br8, which is a 2D material like graphene that has been theorized to host a net electric dipole, as our quantum material barrier of choice and placed it between two superconductors.”
“We were able to peel off just a couple atomic layers of this Nb3Br8 and make a very, very thin sandwich — just a few atomic layers thick — which was needed for making the Josephson diode, and was not possible with normal 3D materials. Nb3Br8, is part of a group of new quantum materials being developed by our collaborators, Professor Tyrel McQueen’s and his group at Johns Hopkins University in the USA, and was a key piece in us realizing the Josephson diode for the first time.”
..."

Reference: “The field-free Josephson diode in a van der Waals heterostructure” by Heng Wu, Yaojia Wang, Yuanfeng Xu, Pranava K. Sivakumar, Chris Pasco, Ulderico Filippozzi, Stuart S. P. Parkin, Yu-Jia Zeng, Tyrel McQueen and Mazhar N. Ali, 27 April 2022, Nature.
https://doi.org/10.1038/s41586-022-04504-8
https://www.nature.com/articles/s41586-022-04504 -8

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Det skal dog bemærkes at Josephson-dioden er superledende i den ene retning og resistiv i den anden. Forskerne har lavet den, men ved ikke endnu hvordan den virker:

Wikipedia: Josephson diode:
https://en.wikipedia.org/wiki/Josephson_diode
Citat: "...
Currently, the precise mechanism behind the Josephson diode effect is not fully understood.
...
There are two types of Josephson diodes, relating to which symmetries are being broken. The inversion breaking Josephson diode and the inversion breaking plus time-reversal breaking Josephson diode.
..."

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Glenn, OZ1HFT

Redigeret 02/04-23 08:52
#2  06/04-23 11:01
Jakob Erland
Indlæg: 5
Svar til #1:

..Vis mig hvor jeg ka´købe den, og jeg skal nok finde på noget rigtig sjovt at bruge den til..

/Jakob E.

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