SKM 2023 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 6: Poster
KFM 6.9: Poster
Dienstag, 28. März 2023, 17:00–19:00, P3
Photo-induced transport properties in ferroelectric lithium niobate single crystals and their domain walls — •L. L. Ding1, E. Beyreuther1, K. Kempf1, M. Rüsing1, and L. M. Eng1,2 — 1Institut für Angewandte Physik, TU Dresden, Nöthnitzer Straße 61, 01187 Dresden, Germany — 2ct.qmat: Dresden-Würzburg Cluster of Excellence - EXC 2147, TU Dresden, 01062 Dresden, Germany
Ferroelectric materials exhibit a spontaneous and stable dielctric polarization, resulting in a variable assembly of domain and domain wall (DW) structures, that have received continuous attention[1]. Furthermore, the multifield-controlled electrical transport offers many prospects for the vivid application of ferroelectrics into electronic devices, such as ferroelectric sensors, memories, even synaptic circuits[2]. Notably, (external) control of the electronic transport through photons is very desirable since being non-invasive and ultrafast, but has been studied only sparsely. In particular, polarization switching of domains and DWs, bandgap modulation, or DW dynamics, all are susceptible to the photon-electron interaction, thus need fundamental clarifications and profound investigations. Here, we combine scanning probe techniques with analyzing the impact of light irradiation onto lithium niobate (domains and) DWs, and vary both intensity and wavelength to probe the local conductivity. This ansatz thus will improve our in-depth knowledge on the local band structure and energy level distribution within DWs, and will lay the foundation to design integrated electro-optical components thereof. [1] D. Meier, et al., Nat. Rev. Mater. 7, 157 (2022) [2] Z. D. Luo, et al., ACS Nano 14, 746 (2020)