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- W2935851306 abstract "We have rigorously shown that a strong Hubbard repulsion can cause superconductivity. The model, which has a particular set of local symmetries, manifests the phase diagram of many unconventional superconductors; anti-ferromagnetism paramagnetism, superconductivity, and even ferromagnetism are all observed. The key technique in the analysis is an exact non-linear fermion transformation, which preserves the correlated motion of electrons while removing the strong interactions. Using resolvent formalism, it is exactly shown that two holes at the Mott point bind to form a localised Cooper pair. As interactions are now weak, we then use BCS mean field theory to calculate the energy, excess pairing, and superconducting gap. These results are compared to exact diagonalisation of finite sized systems and show good agreement. At the Mott point the system is an anti-ferromagnet, and a superconducting phase quickly appears upon doping, and then vanishes." @default.
- W2935851306 created "2019-04-25" @default.
- W2935851306 creator A5011148163 @default.
- W2935851306 creator A5034099492 @default.
- W2935851306 date "2019-04-15" @default.
- W2935851306 modified "2023-09-27" @default.
- W2935851306 title "A Rigorous Demonstration of Superconductivity in a Repulsive Hubbard Model" @default.
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