Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 42: Correlated Electrons: Frustrated Magnets - Strong Spin-Orbit Coupling 2
TT 42.5: Vortrag
Mittwoch, 22. März 2017, 10:30–10:45, HSZ 304
Electronic structure of α-RuCl3 from electron spectroscopy — •Andreas Koitzsch1, Carsten Habenicht1, Eric Müller1, Martin Knupfer1, Bernd Büchner1,2, Hem Kandpal1,3, Jeroen van den Brink1,4, Domenic Nowak5, Anna Isaeva5, and Thomas Doert5 — 1IFW Dresden, Germany — 2Institute for Solid State Physics, TU Dresden, Germany — 3Indian Institute of Technology, Roorkee, India — 4Institute for Theoretical Physics, TU Dresden, Germany — 5Department of Chemistry and Food Chemistry, TU Dresden, Germany
Novel ground states might be realized in honeycomb lattices with strong spin–orbit coupling. Here we study the electronic structure of α-RuCl3, in which the Ru ions are in a d5 configuration and form a honeycomb lattice, by angle-resolved photoemission, x-ray photoemission and electron energy loss spectroscopy supported by density functional theory and multiplet calculations. We find that α-RuCl3 is a Mott insulator with significant spin-orbit coupling, whose low energy electronic structure is naturally mapped onto Jeff states. This makes α-RuCl3 a promising candidate for the realization of Kitaev physics. Relevant electronic parameters such as the Hubbard energy U, the crystal field splitting 10Dq and the charge transfer energy Δ are evaluated.