Resonantly enhanced photoemission from topological surface states in MnBi₆Te₁₀

The dispersion of topological surface bands in MnBi₂Te₄(MBT)-based magnetic topological insulator heterostructures is strongly affected by band hybridization and is spatially inhomogeneous due to varying surface layer terminations on microscopic length scales. Here, we apply micro-focused angle-resolved photoemission spectroscopy with tunable photon energy from 18 to 30 eV to distinguish bulk valence and conduction bands from surface bands on the three surface terminations of MnBi₆Te₁₀. We observe a strong enhancement of photoemission intensity from the topological surface bands at the Bi O₄absorption edge, which is exploited to visualize a gapless Dirac cone on the MBT-terminated surface and varying degrees of hybridization effects in the surface bands on the two distinct Bi₂Te₃-terminated surfaces.