Theoretical analysis reveals high-temperature superconductivity deforms flat bands to yield finite effective mass and robust supercurrents, indicating stability despite repulsive pairing interactions.
In this letter, we examine how the presence of flat band leads to the formation of a high-temperature superconductor even in the case of repulsive pairing interactions. We also show that in the case of flat bands, the high-temperature superconducting state deforms the flat band, tilting it and making the effective mass finite. As a result, neither the superfluid weight nor the supercurrent disappear. Our results are in good agreement with experimental data.
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Shaginyan et al. (2026) studied this question.
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