Towards Mott design by δ-doping of strongly correlated titanates
- Resource Type
- article
- Authors
- Frank Lechermann; Michael Obermeyer
- Source
- New Journal of Physics, Vol 17, Iss 4, p 043026 (2015)
- Subject
- oxide heterostructures
dynamical mean-field theory
density functional theory
Mott transition
strong correlation
doping
Science
Physics
QC1-999
- Language
- English
- ISSN
- 1367-2630
Doping the distorted-perovskite Mott insulators LaTiO _3 and GdTiO _3 with a single SrO layer along the [001] direction gives rise to a rich correlated electronic structure. A realistic superlattice study by means of the charge self-consistent combination of density functional theory with dynamical mean-field theory reveals layer- and temperature-dependent multi-orbital metal-insulator transitions. An orbital-selective metallic layer at the interface dissolves via an orbital-polarized doped-Mott state into an orbital-ordered insulating regime beyond the two conducting TiO _2 layers. We find large differences in the scattering behavior within the latter. Breaking the spin symmetry in δ -doped GdTiO _3 results in blocks of ferromagnetic itinerant and ferromagnetic Mott-insulating layers that are coupled antiferromagnetically.