A concrete example is samarium hexaboride, : narrow, nearly localized -derived states mix with a much more dispersive -derived conduction band. Such band hybridization is the low-energy mechanism behind a bulk Kondo insulator gap. The two-band Hamiltonian is an effective illustration; correlations help set its narrow-band energy and renormalized mixing.[ref]
https://www.nature.com/articles/ncomms3991. Introduction: nearly localized flat f bands hybridize with a dispersive d-derived conduction band in SmB6
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