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Lun-Hui Hu

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Preprint Jul 2026

Quantum Geometry-Driven RKKY: From Flat to Dispersive Bands

In flat-band systems, quantum metric bounds physical observables like superfluid weight and coherence length, suggesting a single geometric scale for spatial correlations. Here, we show that the RKKY exchange in an isolated filled flat band can violate this expectation. With the intraband channel absent, the exchange p...

Zheng-Yi Zhou, Chuang Li, Lun-Hui Hu · 0 citations

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