Novel Chiroptical Probes to Track Spin & Light in Space and Time in Semiconductors

Solution-processable semiconductors like halide perovskites and certain molecules are promising for next-generation spin-optoelectronic applications [1]. Yet, we still don’t fully understand what governs the excitation and spin dynamics in these materials, and how these are affected by chirality.<br/>In this talk, I will give an overview of our recent efforts to understand the spin-optoelectronic performance of these materials by developing time-, space- and polarization-resolved absorption spectroscopy and microscopy. For halide perovskite films, we find here that locally varying degrees of symmetry-breaking drive spin domain formation within picoseconds [2].<br/>I will then briefly explain the fundamentals and artifacts involved in measuring circularly polarized luminescence (CPL) reliably [3], and finally show our most recent development of full Stokes-vector polarimetry with unprecedented time- and polarization resolution to track the emergence of chiral light emission in these fascinating materials [to be submitted].<br/><br/>[1] Crassous,…, Feldmann, Nature Reviews Materials 2023<br/>[2] Ashoka,…, Feldmann & Rao, Nature Materials 2023<br/>[3] Kitzmann,…, Feldmann, Advanced Materials 2023