[Zurück]

L. Si, Oleg Janson, Gang Li, Z. Zhong, Z. Liao, G. Koster, K. Held:
"Quantum Anomalous Hall State in Ferromagnetic SrRuO₃ (111) Bilayers";
Physical Review Letters, 119 (2017), S. 026402.

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.

Ferromagnetism; Quantum anomalous Hall effect; Topological Hall effect; Strongly correlated systems; Topological materials; Dynamical Mean Field Theory;

http://dx.doi.org/10.1103/PhysRevLett.119.026402

Projektleitung Karsten Held:
Ab initio Dynamische Vertex Approximation

Projektleitung Oleg Janson:
Dynamik korrelierter Materialien mit Honycomb-Gitter