Spin-Triplet Superconductivity from Quantum-Geometry-Induced Ferromagnetic Fluctuation
Taisei Kitamura, Akito Daido, Youichi Yanase
DOI 10.1103/PhysRevLett.132.036001 · Physical Review Letters
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Abstract
We show that quantum geometry induces ferromagnetic fluctuation resulting in spin-triplet superconductivity. The criterion for ferromagnetic fluctuation is clarified by analyzing contributions from the effective mass and quantum geometry. When the non-Kramers band degeneracy is present near the Fermi surface, the Fubini-Study quantum metric strongly favors ferromagnetic fluctuation. Solving the linearized gap equation with the effective interaction obtained by the random phase approximation, we show that the spin-triplet superconductivity is mediated by quantum-geometry-induced ferromagnetic fluctuation.
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