Superlederdiode; Josephson-diode - slags envejssuperleder; tæt på ideel diodemodtager diode? Nogen andre forslag til anvendelse?<br /> <br /> April 27, 2022, Breakthrough Discovery of the One-Way Superconductor – Thought To Be Impossible:<br /> https://scitechdaily.com/breakthrough-discovery-of-the-one-way-superconductor-thought-to-be-impossible/<br /> Citat: "...<br /> Q: How did you manage to do what first seemed impossible?<br /> <br /> 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.”<br /> “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.”<br /> ..."<br /> <br /> 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.<br /> https://doi.org/10.1038/s41586-022-04504-8<br /> https://www.nature.com/articles/s41586-022-04504-8<br /> <br /> .<br /> <br /> 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:<br /> <br /> Wikipedia: Josephson diode:<br /> https://en.wikipedia.org/wiki/Josephson_diode<br /> Citat: "...<br /> Currently, the precise mechanism behind the Josephson diode effect is not fully understood.<br /> ...<br /> 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.<br /> ..."<br />
