Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 42: Correlated Electrons: Frustrated Magnets - Strong Spin-Orbit Coupling 2

TT 42.3: Talk

Wednesday, March 22, 2017, 10:00–10:15, HSZ 304

Honeycomb-lattice Heisenberg-Kitaev model in a magnetic field: Spin canting, metamagnetism, and vortex crystals — •Lukas Janssen¹, Eric C. Andrade², and Matthias Vojta¹ — ¹Technische Universität Dresden, Germany — ²Universidade de São Paulo, Brazil

The Heisenberg-Kitaev model is a paradigmatic model to describe the magnetism in honeycomb-lattice Mott insulators with strong spin-orbit coupling, such as A₂IrO₃ (A = Na, Li) and α-RuCl₃. In this talk, I present in detail the physics of the Heisenberg-Kitaev model in an external magnetic field. Using the combined results of Monte-Carlo simulations and spin-wave theory the classical phase diagram for different directions of the magnetic field is mapped out. Broken SU(2) spin symmetry renders the magnetization process rather complex, with sequences of phases and metamagnetic transitions. In particular, various large-unit-cell and multi-Q phases including a vortex-crystal phase occur for a field in the [111] direction. I also discuss quantum corrections in the high-field phase.

[1] L. Janssen, E. C. Andrade, and M. Vojta, arXiv:1607.04640 [cond-mat.str-el] (PRL accepted).