Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 50: Correlated Electrons: Frustrated Magnets - Low-Dimensional Systems

TT 50.4: Talk

Wednesday, March 22, 2017, 15:45–16:00, HSZ 304

Dynamic structure factor of disordered quantum spin ladders — •Max Hörmann and Kai Phillip Schmidt — Universität Erlangen-Nürnberg, D-91058 Erlangen, Germany

We investigate the zero-temperature dynamic structure factor of a two-leg spin-1/2 Heisenberg ladder with quenched disorder relevant for inelastic neutron scattering. To this end we apply perturbative continuous unitary transformations about the limit of isolated rungs using a white-graph expansion [1] to derive the physical properties of the elementary triplon excitations of the disordered spin ladder in the thermodynamic limit. Here we study bimodal disorder on rungs and legs realizable in experiments by intential doping of existing spin-ladder compounds. We focus on the one-triplon properties which we calculate with high precision in the weakly-coupled rung regime. We observe that the dynamic structure factor displays characteristic differences in rung and leg disorder.

[1] K. Coester and K.P. Schmidt, Phys. Rev. E 92, 022118 (2015).