Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 72: Poster Session: Correlated Electrons
TT 72.30: Poster
Wednesday, March 14, 2018, 15:00–19:00, Poster B
Spin-orbital superexchange and spin-orbit coupling — •Pascal Strobel and Maria Daghofer — Universität Stuttgart Institut für funktionelle Materie und Quantentechnologie, 70569 Stuttgart, Deutschland
In recent years t2g spin-orbital models on a honeycomb lattice have been studied with either strong or no spin-orbit coupling. In both cases the ground state was investigated in dependency of Hund’s coupling as well as the ratio of superexchange and direct exchange. With nonexistent spin-orbit coupling one obtains exotic phases like dimer states, while in the case of strong SOC one can find a Kitaev spin liquid phase.
However the phase diagram for intermediate spin-orbit coupling is yet relatively unknown. While [1] proposed a phase diagramm for the superexchange limit, we still need to explore the direct exchange limit as well as the influence of crystal deformation.
In this work we investigate the influence of moderate SOC, Hund’s coupling, as well as the ratio of superexchange and direct exchange on several ordered states, which might be candidates for a ground state at some point in the phase diagram. The analytical results of the superexchange limit can then be compared to the numerical ones of [1]. Of particular interest in this work is whether we can find exotic phases like a spin
liquid even without strong spin orbit coupling.
A. Koga, S. Nakauchi, J. Nasu, arXiv:1705.09659