Regensburg 2016 – scientific programme

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DF: Fachverband Dielektrische Festkörper

DF 7: Focus Session: Ferroic Domain Walls I

DF 7.6: Talk

Tuesday, March 8, 2016, 12:00–12:20, H25

A closer look inside out - Domain wall functionalities in LiNbO₃ single crystals go 3D — •Alexander Haußmann¹, Thomas Kämpfe¹, Christian Godau¹, Philipp Reichenbach¹, André Gemeinhardt¹, Anna-Sophie Pawlik², Andreas Koitzsch², Lars Kirsten³, Edmund Koch³, and Lukas Eng¹ — ¹Institut für Angewandte Physik, TU Dresden, George-Bähr-Str. 1, 01069 Dresden — ²IFW Dresden, Helmholtzstr. 20, 01069 Dresden — ³TU Dresden, Medizinische Fakultät, Klinisches Sensoring und Monitoring, Fetscherstr. 74, 01307 Dresden

Both the discoveries of domain-wall (DW) localized photochemistry and DW conductivity have dramatically broadened the huge interests in ferroelectric LiNbO₃ for the last decade. Surprisingly, it turned out that the DW geometries in this material differ consistently from the ideal equilibrium "textbook" arrangement of 180^∘ domain walls: Low inclinations with respect to the polar (z) axis (< 0.5^∘) as well as unexpectedly complex topologies have been regularly observed, depending on composition, doping and subsequent heat treatment of the material. Here, we combined multiple 2D and 3D methods in order to achieve a comprehensive characterization of both the geometry and the resulting electronic properties of DWs in LiNbO₃. The portfolio of techniques contributing to this study range from high-resolution surface-sensitive techniques (such as PFM, cAFM, KPFM, PEEM) to complementary optical methods allowing for a full 3D inspection (Cherenkov SHG, interferometric quasi-phase-matched SHG, multiphoton photoluminescence, optical coherence tomography).