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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 6: Ferroelectric Domain Walls II (joint session KFM/TT)

KFM 6.9: Vortrag

Montag, 12. März 2018, 18:00–18:15, EMH 225

Correlating domain wall conductivity with geometry: a real-time study via Cerenkov Second Harmonic Generation — •Christian Godau, Lukas Wehmeier, Alexander Haußmann, and Lukas Eng — Institute of Applied Physics, Technische Universität Dresden, D-01062 Dresden, Germany

Ferroelectric domain walls (DWs) have become a central topic of research these days. Especially exploring their electronic properties and domain wall conductivity (DWC) in both thin films [1,2] and single crystals (sc) [3,4,5] has become very attractive. Our recent research on sc-lithium niobate (LNO) has proven an ultra-high DWC [4] and low electronic work function [6] that both provide a solid and promising foundation for prospective electronic device application.

Here, we present a full 3D and time-resolved study by Cerenkov Second Harmonic Generation [7] when investigating the DW dynamics in sc-LNO that are subjected to electric fields. Variations of the field lead to significant changes in geometry and inclination angles of the DW, that is tracked here in real time. These changes in DW-geometry are then correlated to the current measured through the conductive DWs.

[1] J. Seidel et al., Nat. Mater. 8, 229 (2009) [2] S. Cherifi-Hertel et al., Nat. Comm. 8, 15768 (2017) [3] T. Sluka et al., Nat. Comm. 4, 1808 (2013) [4] C. Godau et al., ACS Nano 11, 4816 (2017) [5] M. Schröder et al., Mater. Res. Express 1, 035012 (2014) [6] A.-S. Pawlik et al., Nanoscale 9, 10933 (2017) [7] T. Kämpfe et al., Phys. Rev. B 89, 035314 (2014)