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In the newly discovered magnetic topological insulator MnBi$_2$Te$_4$, bothaxion insulator state and quantized anomalous Hall effect (QAHE) have beenobserved by tuning the magnetic structure. The related(MnBi$_2$Te$_4$)$_m$(Bi$_2$Te$_3$)$_n$ heterostructures with increased tuningknobs, are predicted to be a more versatile platform for exotic topologicalstates. Here, we report angle-resolved photoemission spectroscopy (ARPES)studies on a series of the heterostructures (MnBi$_2$Te$_4$, MnBi$_4$Te$_7$ andMnBi$_6$Te$_{10}$). A universal gapless Dirac cone is observed at theMnBi$_2$Te$_4$ terminated (0001) surfaces in all systems. This is in sharpcontrast to the expected gap from the original antiferromagnetic ground state,indicating an altered magnetic structure near the surface, possibly due to thesurface termination. In the meantime, the electron band dispersion of thesurface states, presumably dominated by the top surface, is found to besensitive to different stackings of the underlying MnBi$_2$Te$_4$ andBi$_2$Te$_3$ layers. Our results suggest the high tunability of both magneticand electronic structures of the topological surface states in(MnBi$_2$Te$_4$)$_m$(Bi$_2$Te$_3$)$_n$ heterostructures, which is essential inrealizing various novel topological states.

Universal gapless Dirac cone and tunable topological states in (MnBi$_2$Te$_4$)$_m$(Bi$_2$Te$_3$)$_n$ heterostructures