Dresden 2020 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 22: Frustrated Magnets - Spin Liquids 1 (joint session TT/MA)

MA 22.10: Vortrag

Dienstag, 17. März 2020, 12:00–12:15, HSZ 304

Dynamics of an SU(2)-symmetric Kitaev model: spectroscopic signatures of fermionic magnons — •Willian Massashi Hisano Natori¹ and Johannes Knolle^1,2,3 — ¹Imperial College London, London, United Kingdom — ²Technische Universitat Munchen, Garching, Germany — ³Munich Center for Quantum Science and Technology, Munich, Germany

In this work, we study the dynamics of an integrable Kugel-Khomskii Hamiltonian defined as an extension of the Kitaev honeycomb model. This model displays a global SU(2) symmetry that leads to S=1 fermionic excitations. We show that these fermions' dynamical response is exactly computed using a few-particle approach and can be experimentally probed with resonant inelastic x-ray scattering. The techniques developed to uncover the dynamics of the Kitaev model are used to compute the expected neutron scattering response. We show that the SU(2) symmetric model exhibits a vison gap three times larger than the spin-1/2 Kitaev model and a broader band of excitations due to the presence of additional Majorana flavors.