Fig. 3: Edge topology of ML Nb3TeCl7. | npj Quantum Materials

Fig. 3: Edge topology of ML Nb3TeCl7.

From: Orbital degree of freedom induced multiple sets of second-order topological states in two-dimensional breathing Kagome crystals

Fig. 3

a Schematic drawing of type-I and type-II edge. Type-I edge is the edge of Configuration 1, while type-II edge is the edge of Configuration 2. The Nb 1st, 2nd and 3rd layer of type-I edge is indicated by numbers. b, c The type-I and type-II edge spectrums, respectively. The two pairs of edge bands for type-I edge are indicated by “1up”, “1down” and “2up”, “2down”. The edge bands that turn to first-order helical edge states under SOC are indicated by white arrows. d–f Band structures projected to the Nb 1st layer, 2nd layer and 3rd layer, respectively. The contribution of five 4d orbitals is indicated by different colors.

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