Fig. 2: Topological phase diagrams for different FI thicknesses.
Top row: energy spectrum at kx = 0 as a function of the top-gate voltage Vtg for a FI thickness of (a) dFI = 1 nm, (b) dFI = 1.5 nm and (c) dFI = 4 nm. Colors represent the weight WSC of each state in the superconducting Al layer. Shaded Vtg regions are those characterized by a trivial phase, i.e., \({{{\mathcal{Q}}}}=+1\); while white regions correspond to a topological phase, i.e., \({{{\mathcal{Q}}}}=-1\). Bottom row (d, e, f): effective exchange coupling heff (solid lines) and superconducting pairing amplitude Δeff (dotted lines) for the lowest-energy state in (a), (b), (c), respectively, as given by Eqs. 2 and 3.
