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Time-reversal-breaking topological phases in antiferromagnetic Sr2FeOsO6 films

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Kanungo,  Sudipta
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Yan,  Binghai
Binghai Yan, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Dong, X.-Y., Kanungo, S., Yan, B., & Liu, C.-X. (2016). Time-reversal-breaking topological phases in antiferromagnetic Sr2FeOsO6 films. Physical Review B, 94(24): 245135, pp. 1-9. doi:10.1103/PhysRevB.94.245135.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002C-519B-5
Abstract
In this work, we studied time-reversal-breaking topological phases as a result of the interplay between antiferromagnetism and inverted band structures in antiferromagnetic 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 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 future transport experiments.