Resonantly enhanced photoemission from topological surface states in MnBi6Te10

Abstract The dispersion of topological surface bands in MnBi 2 Te 4 (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 MnBi 6 Te 10 . We observe a strong enhancement of photoemission intensity from the topological surface bands at the Bi O 4 absorption 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 Bi 2 Te 3 -terminated surfaces.