4. Feb 2020
Competing electron-electron correlations, spin-orbit coupling, and spin-lattice coupling in iridates: how to use them to tune magnetic interactions and charge gap
Datum: 4. Februar 2020 |
Sprecher: Ekaterina Paerschke, IST Austria
Veranstaltungsort: Heinzel Seminar Room / Office Bldg West (I21.EG.101)
After introducing this interesting family of strongly correlated materials in some detail, I will present our recent theoretical advances in understanding charge and magnetic excitations, as revealed by Photoemission Spectroscopy (ARPES) and Resonant Inelastic X-ray scattering (RIXS). In 2018, it was discovered that in iridates, SOC mediates unusual almost rigid locking of the magnetic momenta to the lattice through the orbital momenta. Therefore, tuning the local crystal environment emerges as a new route to control structural and physical properties. I will discuss how magnetic and electronic degrees of freedom can be manipulated by applying external pressure and strain, as discovered recently using RIXS and two-magnon Raman scattering, and how do we understand it from the theoretical perspective.