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We propose a mechanism of superconductivity from purely repulsiveinteractions in the strong coupling regime, where the BCS(Bardeen-Cooper-Schrieffer) mechanism such as the spin-fluctuation approach isdifficult to apply. Based on the SU(2) slave-rotor representation of theHubbard model, we find that the single energy scale for the amplitude formationof Cooper pairs and their phase coherence is separated into two energy scales,allowing the so called pseudogap state where such Cooper pairs are coherentlocally but not globally, interpreted as realization of the density-phaseuncertainty principle. This superconducting state shows the temperature-lineardecreasing ratio of superfluid weight, resulting from strong phasefluctuations.

physical review. b, condensed matter and materials physics

Superconductivity from purely repulsive interactions in the strong  coupling approach : Application of the SU(2) slave-rotor theory to the  Hubbard model