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SUMMARY:TRR 360 Seminar: RIXS interferometry: cluster Mott insulators and bond-directional excitations in Kitaev materials Markus Grüninger
DESCRIPTION:RIXS interferometry: cluster Mott insulators and bond-directional excitations in Kitaev materials \nProf. Dr. Markus Grüninger \nUniversität zu Köln \n  \nCluster Mott insulators provide a platform for novel types of quantum magnets with unconventional magnetic moments. Electrons are localized on a cluster such as a dimer and occupy quasimolecular cluster orbitals. In cluster Mott insulators\, RIXS interferometry reveals the symmetry and character of excited states\, offering a powerful tool to study the electronic structure. We systematically investigate the quasimolecular properties of dimers\, trimers\, and tetrahedra in the 5d transition-metal compounds Ba3MIr2O9\, Ba4NbIr3O12\, and GaTa4Se8. Furthermore\, we discuss the applicability of the cluster picture for 3d GaV4S8. \nRIXS interferometry can also be applied to Kitaev materials such as Na2IrO3 and α-Li2IrO3 and shows distinctive fingerprints of Kitaev physics. Kitaev exchange restricts spin-spin correlations to nearest neighbors\, giving rise to a dimer-like dynamical structure factor. Bond-directional exchange implies the existence of bond-directional excitations. Making use of polarization selection rules\, RIXS reveals this bond-directional character of magnetic excitations in Na2IrO3. \n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminar-tba-markus-gruninger/
LOCATION:University of Augsburg\, Room S-288 + Zoom
CATEGORIES:Seminar
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