Posted on 07/11/2021 7:26:10 AM PDT by Kevmo
A Super New Theory to Explain Superconductivity
By UNIVERSITY OF TSUKUBA JULY 10, 2021
Electricity Superconductivity Concept
A researcher at the University of Tsukuba introduces a new theoretical model of high-temperature superconductivity, in which electrical current can flow with zero resistance, which may lead to extremely efficient energy generation and transmission.
A scientist from the Division of Quantum Condensed Matter Physics at the University of Tsukuba has formulated a new theory of superconductivity. Based on the calculation of the “Berry connection,” this model helps explain new experimental results better than the current theory. The work may allow future electrical grids to send energy without losses.
Superconductors are fascinating materials that may look unremarkable at ambient conditions, but when cooled to very low temperatures, allow electrical current to flow with zero resistance. There are several obvious applications of superconductivity, such as lossless energy transmission, but the physics underlying this process is still not clearly understood. The established way of thinking about the transition from normal to superconducting is called the Bardeen-Cooper-Schrieffer (BCS) theory. In this model, as long as thermal excitations are kept small enough, particles can form “Cooper pairs” which travel together and resist scattering. However, the BCS model does not adequately explain all types of superconductors, which limits our ability to create more robust superconducting materials that work at room temperature.
Now, a scientist from the University of Tsukuba has come up with a new model for superconductivity that better reveals the physical principles. Instead of focusing on the pairing of charged particles, this new theory uses the mathematical tool called the “Berry connection.” This value computes a twisting of space where electrons travel. “In the standard BCS theory, the origin of superconductivity is electron pairing. In this theory, the supercurrent is identified as the dissipationless flow of the paired electrons, while single electrons still experience resistance,” Author Professor Hiroyasu Koizumi says.
As an illustration, Josephson junctions are formed when two superconductor layers are separated by a thin barrier made of normal metal or an insulator. Although widely used in high-precision magnetic field detectors and quantum computers, Josephson junctions also do not fit neatly the inside BCS theory. “In the new theory, the role of the electron pairing is to stabilize the Berry connection, as opposed to being the cause of superconductivity by itself, and the supercurrent is the flow of single and paired electrons generated due to the twisting of the space where electrons travel caused by the Berry connection,” Professor Koizumi says. Thus, this research may lead to advancements in quantum computing as well as energy conservation.
Reference: “Superconductivity by Berry Connection from Many-body Wave Functions: Revisit to Andreev−Saint-James Reflection and Josephson Effect” by Hiroyasu Koizumi, 5 July 2021, Journal of Superconductivity and Novel Magnetism. DOI: 10.1007/s10948-021-05905-y
https://arxiv.org/abs/2105.02364
Condensed Matter ~~---- Superconductivity [Submitted on 5 May 2021] Berry connection from many-body wave functions and superconductivity: Calculations by the particle number conserving Bogoliubov-de Gennes equations
Hiroyasu Koizumi, Alto Ishikawa A fundamentally revised version of superconductivity theory has been put forward by the present authors since the standard theory of superconductivity based on the BCS theory cannot explain superconductivity in cuprates discovered in 1986, and reexaminations on several experimental results on the conventional superconductors indicate the necessity for a fundamental revision.
The revision is made on the origin of the superconducting phase variable, which is attributed to a Berry connection arising from many-body wave functions. With this revision, the theory can be cast into a particle number conserving formalism. We have developed a method to calculate superconducting states with the Berry connection using the particle number conserving version of the Bogoliubov-de Gennes equations. An example calculation is made for a model originally built for cuprate superconductors.
Subjects: Superconductivity (cond-mat.supr-con) Cite as: arXiv:2105.02364 [cond-mat.supr-con] (or arXiv:2105.02364v1 [cond-mat.supr-con] for this version) Submission history From: Hiroyasu Koizumi [view email] [v1] Wed, 5 May 2021 23:07:49 UTC (6,229 KB) Download: PDF PostScript Other formats
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Very cool. But if valid can it be engineered to happen on the scale necessary to transmit industrial quanities of electricity?
“as long as thermal excitations are kept small enough”
The colder it gets,
the slower the little pieces get,
the easier it is for the electricity to catch on to the next little piece,
make a “connection”,
and pass on through.
Ok, got it.
The article doesn't say anything about how this theory would allow superconductivity at room temperatures, as far as I can tell. Not that I understand any of it anyway.
I don’t see “high temperature” specified. 100 degrees Fahrenheit? 4,000 degrees?
L
Ah, the old twisting of space model, Beam me up Scotty. Seriously though: What will be the impact on metal prices if this theory can be applied to carbon molecular transmission of electricity at a greatly increased efficiency? Also: Transmission of electricity from solar and wind farms over the current wire system is a drawback. Not to mention the heat generated that starts forest fires.
University of Tsukuba?
Who would even think that people in Tsukuba could even read!
ML/NJ
Now if we could just figure out quantum conductivity...the electrons would just magically end up being where they’re supposed to be.
That is, unless you’re watching.
Impossible, God did not mean for electrons to “pair bond” and travel without resistance. ;-)
The aim is for room temperature.
Had superconductivity been discovered in the 19th century, Edison might have won the day vs Westinghouse and Tesla.
“Had superconductivity been discovered in the 19th century, Edison might have won the day vs Westinghouse and Tesla.”
Tesla worked for Edison who rejected Tesla’s AC power as splendid but impractical. Tesla quit and set up his own lab.
Due to lack of funds, he sold out to Westinghouse.
As long as we’re on hypotheticals...
Tesla supposedly had wireless power transmission going. So he woulda won the battle of the hypotheticals.
Damn...Why didn't I think of that?
Maybe you did think of it and were just waitin’ on them for the writeup.
I know Tesla originally worked for Edison, but I recall him also working for Westinghouse before Westinghouse bought out his patents.
“I know Tesla originally worked for Edison, but I recall him also working for Westinghouse before Westinghouse bought out his patents.”
No. As part of the purchase Westinghouse paid Tesla as a consultant for one year.
Thanks.
L
If we could only twist time we could go back and kill Hitler, or tell that art academy to applaud his painting abilities.
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