Regensburg 2022 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 21: Correlated Electrons: Poster Session
TT 21.15: Poster
Mittwoch, 7. September 2022, 15:00–18:00, P1
Bond-directional nearest-neighbor excitations in the proximate Kitaev spin liquid Na2IrO3 probed by RIXS — •Marco Magnaterra1, Alessandro Revelli1, Karolin Hopfer1, Christoph Sahle2, Marco Moretti Sala3, Giulio Monaco4, Jan Attig5, Ciarán Hickey5, Anton Jesche6, Philipp Gegenwart6, Simon Trebst5, Paul H. M. van Loosdrecht1, Jeroen van den Brink7, and Markus Grüninger1 — 1II. Physikal. Inst., Universität zu Köln — 2ESRF, Grenoble, France — 3Dip. di Fisica, Politecnico di Milano, Italy — 4Dip. di Fisica, Università di Padova, Italy — 5Inst. für Theo. Physik, Universität zu Köln — 6Exp. Physics VI, University of Augsburg — 7Inst. for Theo. Solid State Physics, IFW Dresden
The Kitaev model hosts a spin-liquid ground state with Majorana fermion excitations. It is based on bond-directional exchange, i.e. Ising-like interactions that couple different spin components on different bonds. In Na2IrO3, resonant inelastic x-ray scattering (RIXS) revealed fingerprints of Kitaev physics in the magnetic excitations [1]. In fact, the RIXS intensity shows a sinusoidal q dependence that proves the nearest-neighbor or single-bond character of the excitations. We report on refined RIXS measurements where we exploit the polarization dependence of the different spin channels and the q dependence of the different bonds to demonstrate the direct connection between spin component and bond direction. Our results establish the bond-directional nearest-neighbor character of magnetic excitations in Na2IrO3.
[1] A. Revelli et al., Phys. Rev. Research 2, 043094 (2020).