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FM: Fachverband Funktionsmaterialien
FM 12: German-French Focus Session: Materials Research in Polar Oxides – From Domain Engineering to Photonic and Electronic Devices I
FM 12.2: Vortrag
Mittwoch, 11. März 2026, 10:00–10:15, BEY/0138
Origin and Evolution of Domain-Wall Conductivity in LiNbO3 — •Iuliia Kiseleva1, Boris Koppitz1, Matthias Roeper1, Elke Beyreuther1, Samuel Seddon1, and Lukas Eng1, 2 — 1Institute of Applied Physics, Technische Universität Dresden, Nöthnitzer Straße 61, Dresden, 01187, Germany — 2ct.qmat: Dresden-Würzburg Cluster of Excellence - EXC 2147, TU Dresden
Ferroelectric domain walls, which effectively serve as two-dimensional interfaces, exhibit functionalities markedly distinct from those of the bulk, such as enhanced conductivity and strong coupling to external fields, making them promising for nanoelectronic applications. Among various systems, lithium niobate (LiNbO3) stands out due to its high Curie temperature, chemical stability, and thoroughly characterized bulk properties. Yet the microscopic origins and dynamic evolution of domain-wall conductivity remain insufficiently understood, largely due to limited in-situ, time-resolved characterization. Here, we combine in-situ second-harmonic-generation (SHG) microscopy with electrical transport measurements and complementary chemical analysis to investigate domain-wall behavior under controlled electric and mechanical loading. This multimodal approach enables real-time visualization of domain restructuring, correlation of conductivity changes with wall inclination, and the dynamics of defects. The results aim to advance the understanding of functional domain-wall states and the mechanism of electrical transport in ferroelectric 2D systems.
Keywords: Ferroelectrics; Lithium Niobate; Domain Walls; Conductance in 2D Materials; Defects