Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 42: Electron-driven Processes
O 42.2: Vortrag
Dienstag, 18. März 2025, 14:15–14:30, H11
Shaping Polarons in Hematite Fe2O3: From Creation to Charge Dynamics — •Sreehari Sreekumar1, Llorenc Albons Caldentey1, Jesus Redondo Redondo1, Aji Alexander1, Sarah Tobisch2, Michele Riva2, and Martin Setvin1 — 1Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic — 2Institute of Applied Physics, Vienna University of Technology, Austria
The non-contact Atomic Force Microscopy (nc-AFM) technique has enabled breakthroughs in single-electron charge manipulation [1]. Here we use this capability to study polaron dynamics. Polarons are self-localized electrons or holes in ionic lattices that are crucial to material properties like conductivity, catalysis, and exotic phenomena such as high-temperature superconductivity and colossal magnetoresistance [2]. Polarons are studied in hematite at the single quasiparticle limit, focusing on the fundamental mechanisms involved in their injection, formation, migration, and interaction with defects [3].
1. Gross, L., et al., Science, 2009. 324(5933).
2. Franchini, C., et al., Nature Reviews Materials, 2021. 6(7).
3. Redondo, J., et al., Science Advances, 2024. 10(44).
The work was supported by project MSMT LL2324 *PoTr*
Keywords: Polarons; Hematite; Charge injection; AFM; Charge migration