Publication date: 15th December 2025
Chirality -the geometric property that renders an object non-superposable on its mirror image- lies at the heart of selective absorption and emissions of circularly polarized light. Although chiral optical responses are well established in organic molecules, nanomaterials, and quantum-confined systems, the microscopic origin of chirality transfer and its amplification in hybrid materials remains not widely investigated. Recent advances suggest that chirality transfer is not governed by a single dominant interaction but instead emerges from the sum of multiple subtle mechanisms. Static models propose that chiral ligands induce asymmetric structural distortions in perovskite nanocrystals (NCs) leading to circularly polarised emission.[1] Complementary single-nanocrystal studies reveal coupling between molecular chirality and band-edge excitonic states, resulting in circularly polarized emission.[2] However, a unified understanding that connects structural organization with dynamical processes is still lacking. In this presentation, we discuss two complementary pathways for chirality transfer in metal halide perovskites: a structural route mediated by nanocrystal assembly, and a dynamic route driven by coherent lattice motion.
First, we investigate structural chirality in chiral-ligand-treated CsPbBr3 NCs. Beyond local ligand-induced distortions, we demonstrate that self-assembly of NCs into ordered superstructures dramatically enhances chirality transfer at the ensemble level with yielding luminescence dissymmetry factors (glum) approaching 10-2. Second, we discuss a dynamic origin of chirality transfer in the two-dimensional perovskite (R-MBA)2PbI4. Using ultrafast transient absorption spectroscopy, we probe coherent vibrational dynamics in both the chiral material and its racemic analogue. We identify a coherent phonon mode at ~5.7 meV that strongly couples to excitons in the chiral crystal but is absent in the racemic counterpart.[3] Overall, static distortion and dynamic phonon-mediated coupling contribute to understanding of chirality transfer mechanisms and the associated phenomena in quantum-confined materials.
The work of P.M. and D.B. is supported by the European Innovation Council Pathfinder Challenges project number 101162112 (RADIANT). We thank Yong Li, Pratik Bhagwat, Rafael Araujo, Jakob Thyr, and Tomas Edvinsson for help with the sample preparation, Raman measurement, and theoretical calculations.
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