Novel chiroptical probes to track spin & light polarization in space & time in emerging semiconductors
Sascha Feldmann a
a Laboratory for Energy Materials, EPFL
Materials for Sustainable Development Conference (MATSUS)
Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
Halide perovskites for quantum technologies - #PeroQuant25
Sevilla, Spain, 2025 March 3rd - 7th
Organizers: Grigorios Itskos, Claudine Katan and Gabriele Raino
Invited Speaker, Sascha Feldmann, presentation 394
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.394
Publication date: 16th December 2024

Solution-processable semiconductors like halide perovskites and certain molecules are promising for next-generation spin-optoelectronic applications [1]. Yet, we don’t fully understand what governs spin and light polarization in these materials, and even less how these are affected by chirality.[2]

In this talk, I will give an overview of our recent efforts to understand the spin-optoelectronic performance of these materials through time-, space- and polarization-resolved spectroscopy and microscopy.

For investigating halide perovskite films, we pushed broadband circular dichroism to diffraction-limited spatial and 15 fs time resolution for creating a spin cinematography technique to witness the ultrafast formation of spin domains due to local symmetry breaking and spin-momentum locking [3].

I will then briefly explain the fundamentals and artefacts involved in measuring circularly polarized luminescence reliably and introduce an open-access methodology and code to do so [4]. Finally, I will show our most recent development of a transient sensitive broadband full Stokes-vector spectroscopy with unprecedented time- and polarization resolution to track the emergence of chiral light emission [5].

[1] Nature Reviews Materials 8, 365 (2023)

[2] Nature Reviews Chemistry, in press (2024/25)

[3] Nature Materials 22, 977 (2023)

[4] Advanced Materials 35, 2302279 (2023)

[5] unpublished (2024/25).

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