Normal-state correlated electronic structure of the tetragonal TlNi2Se2 superconductor

On the basis of density functional plus dynamical mean-field theory calculations we explore the electronic structure of the TlNi2Se2 superconductor, showing how the normal-state spectra are reshaped by dynamical many-particle interactions. Upon electron-doping the 3d8 Fermi liquid metal, hidden orbital selectivity with coexisting Mott localized, pseudogapped, and narrow Kondo-quasiparticle electronic excitations is predicted for TlNi2Se2. By specifically focusing on the energy spectrum that is relevant to the mixed-valence heavy-electron normal state of unconventional superconductors, our findings have the potential to enhance our microscopic understanding of the intricate interplay between many-particle physics and electron band filling, paving the way for further advancements.