  Antiferromagnetic materials, whose time-reversal symmetry is broken, can be
classified into the Z2 topology if they respect some specific symmetry. Since
the theoretical proposal, however, no materials have been found to host the
antiferromagnetic topological (AFT) phase to date. Here, for the first time, we
demonstrate that the topological Kondo insulator SmB6 can be an AFT system when
pressurized to undergo an antiferromagnetic phase transition. In addition to
propose the possible candidate for an AFT material, in this work we also
illustrate the anomalous topological surface states of the AFT phase which has
not been discussed before. Originating from the interplay between the
topological properties and the antiferromagnetic surface magnetization, the
topological surface states of the AFT phase behave differently as compared with
those of a topological insulator. Besides, the AFT insulators are also found
promising in the generation of tunable spin currents, which is an important
application in spintronics.
