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MA: Fachverband Magnetismus

MA 59: Posters Magnetism III

MA 59.39: Poster

Freitag, 20. März 2020, 09:00–12:00, P2/EG

Quasiparticle decay induced by spin anisotropies in the frustrated spin ladder system BiCu₂PO₆ — •Leanna Müller and Götz S. Uhrig — TU Dortmund

The inorganic compound BiCu₂PO₆ contains tubelike structures, which are described magnetically by weakly coupled frustrated spin ladders with a finite gap. The elementary excitations are triplons of which the degeneracy is lifted due to Dzyaloshinskii-Moriya interactions. In certain regions of the Brillouin zone the lifetime of the triplon excitation modes becomes finite due to hybridization of the single-triplon state with two-triplon states. In addition, the dispersions of these triplon modes show peculiar a down-bending before ceasing to exist. In experiment, BiCu₂PO₆ shows various types of decay processes, which can be caused by different symmetry breaking interactions. In previous studies, we established a minimal model to include all symmetry-allowed interactions, such as the Dzyaloshinskii-Moriya interaction. Based on this minimal model, we show that isotropic and anisotropic effects are responsible for noticeable quasiparticle decay and certain down-shifts of the single triplon energies. The analyses are based on a deepCUT approach to the isotropic case augmented by a perturbative treatment of the couplings inducing quasiparticle decay at zero temperature.