Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 37: Frustrated Magnets - Strong Spin-Orbit Coupling 2 (joint session TT/MA)

MA 37.10: Talk

Wednesday, March 18, 2020, 17:30–17:45, HSZ 304

How spin-orbital entanglement depends on the spin-orbit coupling in a Mott insulator — •Dorota Gotfryd^1,2, Ekaterina M. Paerschke^3,4, Andrzej M. Oles^2,5, and Krzysztof Wohlfeld¹ — ¹Faculty of Physics, University of Warsaw, Pasteura 5, PL-02093 Warsaw, Poland — ²Institute of Physics, Jagiellonian University, Lojasiewicza 11, PL-30348 Krakow, Poland — ³Department of Physics, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA — ⁴Institute of Science and Technology Austria, Am Campus 1, 3400 Klosterneuburg, Austria — ⁵Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany

The concept of spin-orbital entanglement plays a crucial role in understanding various phases and exotic ground states in a broad class of materials, including orbitally ordered materials and spin liquids. We investigate how this entanglement depends on the value of the relativistic spin-orbit coupling. To this end, we numerically diagonalise spin-orbital model with the `Kugel-Khomskii' exchange supplemented by the on-site spin-orbit coupling. While for small spin-orbit coupling the ground state resembles the vanishing spin-orbit coupling case, for large spin-orbit coupling it can either show negligible spin-orbital entanglement or can evolve to a highly entangled state with completely distinct properties, described by an effective model. The presented range of spin-orbit coupling is relevant not only for 5d but also for 3d or some of the 4d transition metal oxides.