Fig. 4: Topological phase transition.

Panels a and b plot the spectral functions A_↑(k, ω) in the momentum (k) and the energy (ω) space for the spin-up electrons at g_Lμ_BB_z = 0.45t and 1.45t, respectively. g_L is the Landé factor and μ_B is the Bohr magneton. Panels c and d plot the corresponding spectral functions A_↓(k, ω) for the spin-down electrons. e The evolution of the Bogoliubov gap Δ as a function of the magnetic field B_z. Here, ED and SF denotes that results obtained from exact diagonalization and spectral functions, respectively. f The Chern number C as a function of the magnetic field B_z. Panels g and h plot quasiparticle band structures of a finite thickness ribbon in the trivial superconducting (SC) and topological superconducting states (TSC), respectively. Here, the Rashba spin-orbit coupling is set as λ_SOC = 0.3t and the scattering range is q₀ = 0.4/a.