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TT: Fachverband Tiefe Temperaturen

TT 23: Frustrated Magnets - General

TT 23.2: Talk

Wednesday, September 7, 2022, 15:15–15:30, H22

Dynamic structure factor of the antiferromagnetic Kitaev model in large magnetic fields — •Andreas Schellenberger, Max Hörmann, and Kai Phillip Schmidt — FAU Erlangen-Nürnberg, Erlangen, Deutschland

We investigate the dynamic structure factor of the antiferromagnetic Kitaev honeycomb model in a magnetic field by applying perturbative continuous unitary transformations about the high-field limit. One- and two-quasi-particle properties of the dressed elementary spin flip excitations of the high-field polarized phase are calculated which account for most of the spectral weight in the dynamic structure factor. We discuss the evolution of spectral features in these quasi-particle sectors in terms of one-quasi-particle dispersions, two-quasi-particle continua, the formation of anti-bound states, and quasi-particle decay. In particular, a comparably strong spectral feature above the upper edge of the upmost two-quasi-particle continuum represents three anti-bound states which form due to nearest-neighbor density-density interactions. [1]arXiv:2203.13546 [cond-mat.str-el]