SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 23: Poster Magnetism I

MA 23.40: Poster

Dienstag, 28. März 2023, 17:00–19:00, P1

Spatio-temporal Characterization of 3D Perovskites with Faraday Holography — •Julia Anthea Gessner, Jonathan Zerhoch, Shangpu Liu, and Felix Deschler — Physikalisch-Chemisches Institut, Im Neuenheimer Feld 229, Heidelberg, Germany

Hybrid metal halide perovskites have shown to be a promising class of semiconducting materials for a variety of applications ranging from LEDs, solar cells to spintronic devices. Compared to conventional materials, perovskites exhibit some advantageous features as a high quantum efficiency and tunability in the visible range, as well as a strong spin-orbit coupling for an efficient optical spin manipulation.

A preliminary step towards the integration of perovskites in spintronic devices is the time- and space-resolved optical study of their magnetic properties. In the present work, we study the spatio-temporal spin dynamics of Methylammonium Lead Tribromide (MAPbBr3) by the unique combination of two spectroscopic methods: time-resolved Faraday rotation spectroscopy and off-axis holographic imaging. The Faraday angle, which is a measure for the materials' magnetic moment, is imaged by an Ultrafast Transient Holographic Microscope (UTHC). The UTHC works as an all-optical lock-in amplifier with no upper limitations in the signal repetition rate.

By performing Faraday Holography at different temperatures and fluences, we are hence able to investigate the spatial evolution of optically spin-polarized excitons and identify the dominating spin relaxation mechanisms. This is essential for the optimization of the materials' properties and the future realization of spintronic systems.