Quantum Anomalous Hall State in Ferromagnetic SrRuO3 (111) Bilayers

Liang Si, Oleg Janson, Gang Li*, Zhicheng Zhong, Zhaoliang Liao, Gertjan Koster, Karsten Held

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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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 2 μB/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.

Original languageEnglish
Article number026402
Number of pages5
JournalPhysical review letters
Volume119
Issue number2
DOIs
Publication statusPublished - 13 Jul 2017

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