Dresden 2017 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 76: Topological Insulators II (joined session with TT)
HL 76.4: Talk
Thursday, March 23, 2017, 16:00–16:15, POT 251
time-reversal-breaking topological phases in anti-ferromagnetic Sr2FeOsO6 films — •Xiao-Yu Dong1,2, Sudipta Kanungo3,4, Binghai Yan2,3, and Chao-Xing Liu5 — 1Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, P.R.China — 2Max-Planck-Institut für Physik komplexer Systeme, 01187, Dresden, Germany — 3Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden, Germany — 4Center for Emergent Matter Science (CEMS), RIKEN, 2-1, Hirosawa, Wako, Saitama 351-0198, Japan — 5Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802-6300, USA
In this work, we studied time-reversal-breaking topological phases as a result of the interplay between anti-ferromagnetism and inverted band structures in anti-ferromagnetic double perovskite transition metal Sr2FeOsO6 films. 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 anti-ferromagnetic materials, it is essential to break the combined symmetry of time reversal and inversion, which generally exists in anti-ferromagnetic 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.