Regensburg 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 50: Poster Session: Correlated Electrons 2
TT 50.7: Poster
Mittwoch, 3. April 2019, 15:00–18:30, Poster D
RIXS on Ba3CeIr2O9: an inelastic incarnation of Young’s double-slit experiment — •Alessandro Revelli1, Marco Moretti Sala2, Giulio Monaco3, Petra Becker4, Maria Hermanns5, Philipp Warzanowski1, Paul van Loosdrecht1, Daniel Khomskii1, Jeroen van den Brink6, and Markus Grüninger1 — 1II. Physikalisches Institut, Universität zu Köln — 2ESRF, Grenoble, France — 3Universita di Trento, Italy — 4Abt. Kristallographie, Institut fur Geologie und Mineralogie, Universitat zu Köln, Germany — 5Stockholm University, Sweden — 6IFW Dresden
Young’s archetypal double-slit experiment forms the basis for modern diffraction techniques. We report on an inelastic incarnation of Young’s experiment and demonstrate that resonant inelastic x-ray scattering (RIXS) measures interference patterns which reveal the symmetry and character of electronic excited states in the same way as elastic scattering does for the ground state.
A prototypical example is provided by the quasi-molecular electronic structure of insulating Ba3CeIr2O9 with face-sharing IrO6 octahedra forming structural Ir dimers. The double ’slits’ in this resonant experiment are the highly localized core levels of the two Ir atoms within a dimer. The clear double-slit-type sinusoidal interference patterns that we observe allow us to characterize the electronic excitations. The physics is well described by quasi-molecular orbitals. The ground state shows a spin-orbit-entangled j = 0 singlet predominantly built from j = 1/2 moments with the corresponding triplet excitation lying at an extraordinarily large energy of 1.2 eV.
A. Revelli et al., Science Advances, in press (2018).