Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 42: Correlated Electrons: Frustrated Magnets - Strong Spin-Orbit Coupling 2
TT 42.3: Vortrag
Mittwoch, 22. März 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).