Negative thermal expansion (NTE), referring to the lattice contraction upon heating, has
been an attractive topic of solid-state chemistry and functional materials. The response of a …

The control of the Mott phase is intertwined with the spatial reorganization of the electronic
states. Out-of-equilibrium driving forces typically lead to electronic patterns that are absent at …

Doped Mott insulators are the starting point for interesting physics such as high temperature
superconductivity and quantum spin liquids. For multi-band Mott insulators, orbital selective …

With strong correlations between lattice, spin, and charge degrees of freedom, the layered
ruthenate C a 2 Ru O 4 has attracted considerable interest over the past few decades due to …

In Ca 2 RuO 4, the competition of spin-orbit coupling ζ and tetragonal crystal-field splitting Δ
CF has been discussed controversially for many years. The orbital occupation depends on Δ …

We have investigated the structural, electronic and magnetic properties of the Mott insulator
Ca2RuO4 under the application of a static external electric field in two regimes: bulk systems …

Modern techniques for the investigation of correlated materials in the time domain combine
selective excitation in the THz frequency range with selective probing of coupled structural …

We present a combined oxygen K-edge x-ray absorption spectroscopy and resonant
inelastic x-ray scattering (RIXS) study of the bilayer ruthenate Ca 3 Ru 2 O 7. Our RIXS …

Understanding and controlling the transition between antiferromagnetic states having
different symmetry content with respect to time-inversion and space-group operations are …

We derive an S= 1 spin polaron model which describes the motion of a single hole
introduced into the S= 1 spin antiferromagnetic ground state of Ca 2 RuO 4. We solve the …