Dresden 2017 – scientific programme

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MA: Fachverband Magnetismus

MA 44: PhD Symposium Quantum Magnets (contributed talks)

MA 44.3: Talk

Wednesday, March 22, 2017, 15:30–15:45, HSZ 403

Minimal model for the frustrated spin ladder system BiCu₂PO₆ — •Leanna Splinter¹, Nils Alexander Drescher², Holger Krull³, and Götz Silvester Uhrig⁴ — ¹tu Dortmund — ²tu Dortmund — ³tu Dortmund — ⁴tu Dortmund

The microscopic model of the compound BiCu₂PO₆ contains tubelike structures, which can be described by coupled frustrated spin ladders with a finite gap. Inelastic neutron scattering experiments showed that the triplon excitation modes are split and not three-fold degenerate, as would be expected for spin isotropy. Because of the large atomic number of the bismuth ions (Z=83) the spin-orbit-coupling has a non-negligible effect by the Dzyaloshinskii-Moriya interaction on the dispersion. Using a deepCUT approach for the isotropic model and including the anisotropic interactions on a mean-field level we are able to describe the low-energy part of the dispersions by Dzyaloshinskii-Moriya interactions of about 30 % [1]. Additionally, we can reproduce the magnetic field dependence. Currently, we are extending our model from the one-particle level to including quasi-particle decay, which is induced by the anisotropic interactions. The hydridization between one- and two-triplon states is claimed to explain the different bending behaviour of the individual triplon dispersions [2].

[1] L. Splinter et al., Phys. Rev. B 94, 155115 (2016).

[2] K. W. Plumb et al., Nat. Phys. 12, 224 (2015).