ATTENTION !!! CHANGEMENT D’HORAIRE !!! Effect of non-local correlations on spectral properties of pure and electron-doped Sr2IrO4

Orateur : Benjamin LENZ (Ecole Polytechnique, Palaiseau)

The spin-orbit Mott insulator Sr2IrO4 has raised tremendous interest recently due to striking similarities to high-Tc superconducting co pper oxides both in the pure and in electron-doped compounds. In this talk, we study the evolution of the spectral function of this 5d transition metal system as a function of doping by means of a combined ab-initio electronic structure and many-body quantum cluster approach. Thereby, important ingredients like spin-orbit coupling and distortions of the oxygen octahedra as well as Hubbard interactions and non-local charge fluctuations are taken into account. The spectral function of pure Sr2IrO4 is analyzed both in its high-temperature paramagnetic and in its low-temperature antiferromagnetic phase and the importance of non-local fluctuations is discussed. The spectra compare well with angular-resolved photoemission measurements and allow to study emerging changes under electron- and hole-doping. Special emphasis is placed on pseudogap features of the spectral function of electron-doped Sr2IrO4, which are found to be in good agreement with experiment.

Télécharger dans mon agenda