Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 76: Topological Insulators II (joined session with TT)

HL 76.4: Vortrag

Donnerstag, 23. März 2017, 16:00–16:15, POT 251

time-reversal-breaking topological phases in anti-ferromagnetic Sr₂FeOsO₆ films — •Xiao-Yu Dong^1,2, Sudipta Kanungo^3,4, Binghai Yan^2,3, 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.