Fig. 4: Comparison between ARPES-measured and DFT-calculated surface states.
From: A van der Waals antiferromagnetic topological insulator with weak interlayer magnetic coupling
a–c The DFT-calculated k-E map along \({\bar{\mathrm{K}}} \leftarrow {\bar{\mathrm{\Gamma }}} \to {\bar{\mathrm{K}}}\) on the [MnBi2Te4] SL termination: a surface and bulk (S+B) spectrum, b bulk only, and c surface only. d, e The experimental ARPES spectrum on the [MnBi2Te4] SL termination obtained with 47 eV, linear horizontal light: d along Μ←Γ→Μ, e along Κ←Γ→Κ high symmetry direction. f, g The DFT-calculated k-E map along \({\bar{\mathrm{K}}} \leftarrow {\bar{\mathrm{\Gamma }}} \to {\bar{\mathrm{K}}}\) on the [Bi2Te3] QL termination: f surface and bulk (S+B) spectrum, g surface only. h, i The experimental ARPES spectrum on the [Bi2Te3] QL termination obtained with 47 eV, linear horizontal light: h along Μ←Γ→Μ, i along Κ←Γ→Κ high symmetry direction. j The EDC plot at the Γ point (blue-line cut in i) showing three main peaks corresponding to the bulk conduction band, surface conduction band, and mixed surface/bulk valence band. The green curve shows the fitted Voigt profile peaks which sum to the blue curve.
