Figure 2: Bulk and edge eigenstates of the orbital ladder. | Nature Communications

Figure 2: Bulk and edge eigenstates of the orbital ladder.

From: Topological states in a ladder-like optical lattice containing ultracold atoms in higher orbital bands

Figure 2

(a) A pictorial representation of the simplified Hamiltonian in the flat band limit ts=tp=tsp showing the emergence of isolated edge modes. The definition of the φ operator is given in the main text. (b) The eigen energy of a ladder with finite length L=12 showing two degenerate zero energy states inside the gap. (c) The probability distribution of the in-gap states (equation (10)) for varying strengths of inter-orbital interaction Usp. The in-gap states are shown localized on the edges and survive against finite interaction. In b and c, we choose ts=tp=2tsp (taken as the energy unit).

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