Quantum Anomalous Hall State in Ferromagnetic SrRuO3 (111) Bilayers

Liang Si, Oleg Janson, Gang Li, Zhicheng Zhong, Zhaoliang Liao, Gertjan Koster, and Karsten Held
Phys. Rev. Lett. 119, 026402 – Published 13 July 2017

Abstract

SrRuO3 heterostructures grown in the (111) direction are a rare example of thin film ferromagnets. By means of density functional theory plus dynamical mean field theory we show that the half-metallic ferromagnetic state with an ordered magnetic moment of 2μB/Ru survives the ultimate dimensional confinement down to a bilayer, even at elevated temperatures of 500 K. In the minority channel, the spin-orbit coupling opens a gap at the linear band crossing corresponding to 34 filling of the t2g shell. We predict that the emergent phase is Haldane’s quantum anomalous Hall state with Chern number C=1, without an external magnetic field or magnetic impurities.

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  • Received 6 October 2016

DOI:https://doi.org/10.1103/PhysRevLett.119.026402

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Liang Si1, Oleg Janson1, Gang Li1,2,*, Zhicheng Zhong3, Zhaoliang Liao4, Gertjan Koster4, and Karsten Held1,†

  • 1Institut für Festkörperphysik, TU Wien, Wiedner Hauptstraße 8-10, 1040 Vienna, Austria
  • 2School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
  • 3Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany
  • 4MESA+Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500AE Enschede, Netherlands

  • *ligang@shanghaitech.edu.cn
  • held@ifp.tuwien.ac.at

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Vol. 119, Iss. 2 — 14 July 2017

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