Resonantly enhanced photoemission from topological surface states in MnBi${}_6$Te${}_{10}$

Abstract

The dispersion of topological surface bands in MnBi${}_2$Te${}_4$-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${}_{1}0$. We observe a strong enhancement of photoemission intensity from the topological surface bands at the Bi O4 absorption edge, which is exploited to visualize a gapless Dirac cone on the MnBi${}_2$Te${}_4$-terminated surface and varying degrees of hybridization effects in the surface bands on the two distinct Bi${}_2$Te${}_3$-terminated surfaces.

arXiv comment7 pages, 4 figures

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