Chiroptical probes to track spin & light polarization in space & time
Sascha Feldmann a
a Laboratory for Energy Materials, École Polytechnique Fédérale de Lausanne (EPFL), Rue de l’Industrie 17, 1951 Sion, Switzerland
Proceedings of MATSUS Fall 2026 Conference (MATSUSFall26)
B3 Chirality in Optoelectronics: Approaches, Challenges, and Opportunities
Palma, Spain, 2026 October 26th - 30th
Organizers: Dmitry Baranov, Beatriz Martin Garcia and Agustín Mihi
Invited Speaker, Sascha Feldmann, presentation 078
Publication date: 22nd July 2026

Solution-processable semiconductors such as halide perovskites and certain molecules are promising for next-generation spin-optoelectronic applications [1]. Yet, we don’t fully understand what mechanisms govern charge, spin and light polarization in such emerging energy 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, and how these insights may enhance the performance of solar cells and other energy conversion applications.

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 introduce 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 [4].

To conclude, I will apply some of the above tools to the study of new halide perovskite materials [5].

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

[2] Nature Reviews Chemistry 9, 208 (2025).

[3] Nature Materials 22, 977 (2023).

[4] Nature 643, 675 (2025).

[5] Unpublished (2026).

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