Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 59: Low-Dimensional Systems: Poster Session

TT 59.8: Poster

Mittwoch, 9. März 2016, 15:00–18:30, Poster D

Spin textures in j=1/2 Mott insulators on the triangular lattice — •Tilman Disselkamp and Simon Trebst — University of Cologne

Spin-orbit entangled j=1/2 Mott insulators can give rise to unconventional forms of magnetism, which has sparked an interest in Heisenberg-Kitaev models thought to capture their essential microscopic interactions. Our focus is on j=1/2 Mott insulators in triangular lattice geometries relevant, e.g. to Ba₃IrTi₂O₉ , for which we study the interplay of geometric frustration and spin-orbit coupling. While the pure Heisenberg model is known to exhibit 120 degree order, non-trivial spin textures are induced by an infinitesimal Kitaev coupling or a Dzyaloshinskii-Moriya exchange. The former stabilizes a Z₂ vortex phase, while the latter gives rise to a skyrmion lattice. Using numerical simulation techniques, we map out the stability of these spin textures at zero and finite temperatures.