General Physics and Astronomy; Strongly correlated systems; Ferromagnetism; Quantum anomalous Hall effect; Topological Hall effect; Topological materials; Dynamical Mean Field Theory
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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.
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Project title:
Ab initio Dynamical Vertex Approximation: 306447 (Europäischer Forschungsrat (ERC)) Dynamics of correlated materials with honycomb lattice: M 2050-N34 (Fonds zur Förderung der wissenschaftlichen Forschung (FWF))
