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Regensburg 2019 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 10: Ferroics - Domains and Domain Walls

KFM 10.10: Vortrag

Dienstag, 2. April 2019, 12:20–12:35, H47

Hall effect probed within highly- conducting ferroelectric domain walls in single-crystalline Lithium Niobate — •Henrik Beccard, Benjamin Kirbus, Alexander Haußmann, Elke Beyreuther, and Lukas M. Eng — Institute of Applied Physics, TU Dresden, Nöthnitzer-Str. 61, 01187 Dresden, Germany

Conducting domain walls (CDWs) in single-crystalline lithium niobate (LNO) are promising candidates for generating a manifold of possible nanoscale devices, especially based on electronic and optical properties [1]. Much works focused on improving imaging methods [2] and developing new devices utilizing CDWs. Moreover, novel protocols have been proposed that allow to tuned the domain wall current up to the mA regime [3]. Nevertheless, some of the most fundamental properties of charge carrier transport within these CDWs could not be measured accurately. We thus thoroughly inspected a single CDW in LNO using macroscopic Hall transport measurements. As a result, the mobility and charge carrier density of CDWs in LNO could be determined. Additionally, the influence of UV illumination on charge the charge carrier density within the wall was investigated. Utilizing Cherenkov second-harmonic generation, we were also able to record 3D images of these domain walls hence correlating [4] the Hall transport current to the local inclination of the domain within the LNO single crystal.

[1] G. Catalan et al. Rev. Mod. Phys. 84, 119 (2012).

[2] T. Kämpfe et al. Phys. Rev. B 8, 035314 (2014).

[3] C. Godau et al. ACS Nano 11, 4816 (2017).

[4] B. Wolba et al. Adv. Electron. Mater. 4, 1700242 (2017).

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