4.7 Article

Coexistence of the hourglass and nodal-line dispersions in Nb3SiTe6 revealed by ARPES

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Summary: By using spin-resolved and angle-resolved photoemission spectroscopy, as well as first-principles calculations, the study identified bulk band inversion and a spin-polarized surface state evolved from a weak topological insulator phase in van der Waals materials Nb3XTe6 (X = Si, Ge). The unique topological state with nonsymmorphic symmetry protection consists of a pair of valence and conduction bands encoding weak TI and hourglass semimetal nature, differing from previously studied TIs based on band inversions without symmetry protections.

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