Time-reversal-breaking topological phases in antiferromagnetic   Sr$_2$FeOsO$_6$ films
  In this work, we studied time-reversal-breaking topological phases as a result of the interplay between antiferromagnetism and inverted band structures in thin films of antiferromagnetic double perovskite transition-metal Sr$_2$FeOsO$_6$. By combining the first-principles calculations and analytical models, we demonstrate that the quantum anomalous Hall phase and chiral topological superconducting phase can be realized in this system. We find that to achieve time-reversal-breaking topological phases in antiferromagnetic materials, it is essential to break the combined symmetry of time reversal and inversion, which generally exists in antiferromagnetic structures. As a result, we can utilize an external electric gate voltage to induce the phase transition between topological phases and trivial phases, thus providing an electrically controllable topological platform for the future transport experiments. 
Xiao-Yu Dong, Sudipta Kanungo, Binghai Yan, Chao-Xing Liu
cond-mat.supr-con cond-mat.mes-hall cond-mat.mtrl-sci