Angle-resolved photoemission directly observes a flat band in NbOCl2 and TaOCl2 that persists in few-layer flakes at room temperature, with DFT/Wannier analysis attributing it to Peierls dimerization plus Lieb-like orbital hybridization.
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Robust Orbital-Selective Flat Bands in Transition-Metal Oxychlorides
Angle-resolved photoemission directly observes a flat band in NbOCl2 and TaOCl2 that persists in few-layer flakes at room temperature, with DFT/Wannier analysis attributing it to Peierls dimerization plus Lieb-like orbital hybridization.