Theory of new superconductivity generated by the itinerant-localized duality

解决了奇频超导稳定性的“四十年难题”。结果表明，自旋涨落通过巡游局域二象性极大地影响了超导性（如超流体密度的降低）。当自旋涨落足够强时，流动局域对偶可以实现零场FFLO状态。我们发现，不仅在强相关电子系统中，而且在强电子-声子耦合系统中，都可以实现奇频超导。

The "40 years problem" of the stability of odd-frequency superconductivity is solved. It is shown that the spin fluctuation largely affects the properties of superconductivity (e.g. the reduction of the superfluid density) through the itinerant-localized duality. It is also shown that the itinerant-localized duality can realize the zero-field FFLO state when the spin fluctuation is strong enough. We found that not only in the strongly correlated electron systems, but also in the strong electron-phonon coupling systems, the odd-frequency superconductivity can be realized.