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Topological surface states with intrinsic magnetic ordering in theMnBi$_2$Te$_4$(Bi$_2$Te$_3$)$_n$ compounds have been predicted to host richtopological phenomena including quantized anomalous Hall effect and axioninsulator state. Here we use scanning tunneling microscopy to image the surfaceDirac fermions in MnBi$_2$Te$_4$ and MnBi$_4$Te$_7$. We have determined theenergy dispersion and helical spin texture of the surface states throughquasiparticle interference patterns far above Dirac energy, which confirms itstopological nature. Approaching the Dirac point, the native defects in theMnBi$_2$Te$_4$ septuple layer give rise to resonance states which extendspatially and potentially hinder the detection of a mass gap in the spectra.Our results demonstrate that regulating defects is essential to realize exotictopological states at higher temperatures in these compounds.

Mapping the Dirac fermions in intrinsic antiferromagnetic topological insulators (MnBi$_2$Te$_4$)(Bi$_2$Te$_3$)$_n$ (n=0, 1)