Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 88: Electronic Structure of Surfaces II

O 88.9: Vortrag

Donnerstag, 4. April 2019, 17:00–17:15, H26

Dielectric surface properties of SrTiO₃(001) surface studied by HREELS — •Jonas Pantzer¹, Florian Schumann¹, Manuel Bibes², and Wolf Widdra^1,3 — ¹Martin-Luther-Universität Halle-Wittenberg, 06120 Halle, Germany — ²Unité mixte de physique CNRS/Thales, 91767 Palaiseau, France — ³Max Planck Institute for Microstructure Physics, 06120 Halle, Germany

SrTiO₃ is often considered as one of the most surprising materials in the complex oxides family [1]. The discovery of a two-dimensional electron gas (2DEG) at interfaces of SrTiO3 with LaAlO₃ [2] and the bare surface of SrTiO₃(001) [3] represents a milestone towards exploiting such properties in oxide devices.

Here we report on high-resolution electron energy loss spectroscopy (HREELS) studies of the SrTiO₃(001) surface for different preparation conditions, different doping levels, and upon adsorption of aluminum. From surface phonon-polariton and surface plasmon polariton line shapes, we extract the charge carrier contribution and the full complex surface dielectric response.

[1] Yun-Yi Pai et al., Rep. Prog. Phys. 81, 036503 (2018)

[2] Ohtomo et al., Nature 427, 423-426 (2004)

[3] W. Meevasana et al., Nat. Mater. 10, 114-118 (2011)