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Topological insulators are emerging materials with insulating bulk andsymmetry protected nontrivial surface states. One of the most fascinatingtransport behaviors in a topological insulator is the quantized anomalous Hallinsulator, which has been observed inmagnetic-topological-insulator-baseddevices. In this work, we report a successful doping of rare earth element Tbinto Bi$_{1.08}$Sb$_{0.9}$Te$_2$S topological insulator single crystals, inwhich the Tb moments are antiferromagnetically ordered below ~10 K. Benefitingfrom the in-bulk-gap Fermi level, transport behavior dominant by thetopological surface states is observed below ~ 150 K. At low temperatures,strong Shubnikov-de Haas oscillations are observed, which exhibit 2D-likebehavior. The topological insulator with long range magnetic ordering in rareearth doped Bi$_{1.08}$Sb$_{0.9}$Te$_2$S single crystal provides an idealplatform for quantum transport studies and potential applications.

Antiferromagnetic topological insulating state in Tb$_{0.02}$Bi$_{1.08}$Sb$_{0.9}$Te$_2$S single crystals