A Brand-New Concept of Superconductivity
A team of researchers from the College of Tsukuba’s Division of Quantum Condensed Issue Physics has devised a new theory of superconductivity. Based on the estimation of the ‘Berry connection,’ this model contributes far more to explaining new findings from experiments than the current theory. The research could enable future electrical grids to send out power with no waste.
The superconductors are amazing materials that appear ordinary at room temperature, but when cooled to extremely low temperatures, they allow electric current to flow without resistance. Superconductivity has various obvious applications, such as lossless energy transmission, but the physics connected with this process is still not fully understood. The Bardeen-Cooper-Schrieffer (BCS) theory is the typical way of thinking about the transition from normal to superconducting.
Molecules in this model may develop “Cooper pairs” that move together and resist scattering as long as thermal excitations are low enough. The BCS design, on the other hand, does not completely explain all sorts of superconductors, limiting our ability to construct even more robust superconducting devices which function at normal temperatures.
A professor at the University of Tsukuba researcher has developed a brand-new superconducting model that better explains physical principles. Instead of focusing on the pairing of charged particles, this novel idea use the ‘Berry link’ mathematical technique. This number computes a space winding through which electrons move. “According to the basic BCS concept, electron pairing is the place to begin for superconductivity.” “In this theory,supercurrent is CARACTERIZED as the dissipationless flow of coupled electrons, whereas single electrons continue to encounter the resistance,” adds The writer Teacher Hiroyasu Koizumi.
Josephson’s joints, for example, are generated when two superconductor layers are separated by a thin barrier of regular steel or an insulator. Josephson junctions, despite being widely used in high-precision magnetic field detectors and quantum computers, do not fit well with the BCS theory. “According to the brand-new theory, electron pairing must maintain the Berry link rather than getting the cause of superconductivity upon its own, and supercurrent is the flow of solitary and paired electrons generated by the twisting of the area where electrons move caused by the Berry link,” demonstrates Professor Koizumi. As a result, this research could lead to advances in quantum computing and energy conservation.
Originally published on Scitechdaily.com. Read the original article.
Reference: Hiroyasu Koizumi, Superconductivity by Berry Connection from Many-body Wave Functions: Revisit to Andreev−Saint-James Reflection and Josephson Effect, Journal of Superconductivity and Novel Magnetism (2021). DOI: 10.1007/s10948-021-05905-y
