Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 17: Low-Dimensional Systems: Oxide Hetero-Interfaces

TT 17.4: Vortrag

Montag, 7. März 2016, 15:45–16:00, H22

Non-Fermi-liquid behavior in δ-doped SmTiO₃ from first principles — •Frank Lechermann — I. Institut für Theoretische Physik, Universität Hamburg, 20355 Hamburg — Institut für Keramische Hochleistungswerkstoffe, Technische Universität Hamburg-Harburg, 21073 Hamburg

Most stoichiometric condensed matter underlying stronger electronic correlations comes in two flavors. Either the compound is metallic with usually well-defined quasiparticles at low energy, or it is in a Mott-(or charge-transfer-)insulating state with robust Hubbard bands at high energy seperated by a sizable charge gap. Doped Mott insulators are more difficult to characterize, since e.g. introduced itinerancy often has to cope with preexisting ordered states of magnetic kind. Furthemore, bulk doping of Mott insulators is plagued by disorder effects, which are hard to capture theoretically by simple means.

Novel oxide heterostructures provide an alternative way of doping Mott-insulating materials by introducing well-defined doping layers in given host materials. Recent experimental work on δ-doped titanates has shown the possibility for new emerging physics [1]. In this talk an advanced DFT+DMFT study of the δ-doped 3d¹ titanate SmTiO₃ is presented. Layer- and temperature-dependent multi-orbital Mott transitions as well as spin and orbital polarizations are discussed. The intricate transport behavior in the conducting layers of the established itinerant interface state will be elucidated.
C. A. Jackson, J. Y. Zhang, C. R. Freeze and S. Stemmer,

Nat. Commun. 5, 4258 (2014).