# Dresden 2017 – wissenschaftliches Programm

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# MA: Fachverband Magnetismus

## MA 44: PhD Symposium Quantum Magnets (contributed talks)

### MA 44.3: Vortrag

### Mittwoch, 22. März 2017, 15:30–15:45, HSZ 403

**Minimal model for the frustrated spin ladder system BiCu**_{2}**PO**_{6} — •Leanna Splinter^{1}, Nils Alexander Drescher^{2}, Holger Krull^{3}, and Götz Silvester Uhrig^{4} — ^{1}tu Dortmund — ^{2}tu Dortmund — ^{3}tu Dortmund — ^{4}tu Dortmund

The microscopic model of the compound BiCu_{2}PO_{6} 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).