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TT: Fachverband Tiefe Temperaturen

TT 25: Disordered Quantum Systems

TT 25.3: Vortrag

Dienstag, 2. April 2019, 10:00–10:15, H23

Dynamic Structure Factor of Disordered Coupled-Dimer Heisenberg models — •Max Hörmann and Kai Schmidt — Institut für Theoretische Physik I, Universität Erlangen-Nürnberg, Staudtstraße 7, 91058 Erlangen

We investigate the impact of quenched disorder on the zero-temperature dynamic structure factor of coupled-dimer Heisenberg models on the two-leg ladder and the two-dimensional square lattice bilayer. Using perturbative continuous unitary transformations, huge effects on individual quasiparticles but also on composite bound states and two-quasiparticle continua are observed [1]. This leads to intriguing quantum structures in dynamical correlation functions well observable in spectroscopic experiments.
M. Hörmann, P. Wunderlich, K. P. Schmidt, Phys. Rev. Lett. 121, 167201 (2018)