Dresden 2020 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 43: Frustrated Magnets - Strong Spin-Orbit Coupling 2 (joint session TT/MA)
TT 43.6: Talk
Wednesday, March 18, 2020, 16:30–16:45, HSZ 304
Raman spectrum of two particle excitations in the Kitaev-Heisenberg bilayer — •Erik Wagner and Wolfram Brenig — Institute for Theoretical Physics, Technical UniversityBraunschweig, Braunschweig, Germany
We study the Raman response of a honeycomb Kitaev spin-model with (an-)isotropic intralayer exchange Jx,y,z, coupled by additional interlayer Heisenberg exchange J to form a bilayer. Starting from the limit of decoupled dimers we use a perturbative continuous unitary transformation (pCUT), based on the flow equation method, to perform series expansion on the Hamiltonian and the Raman operator to analyze the spectrum. In particular we consider the groundstate energy and one particle dispersion up to 9th order in Jx,y,z as well as the two particle interactions and spectrum up to 8th order. Results for the Raman response as well as (anti-)bound states will be presented versus anisotropy and for various bilayer-stackings.