Optical control of spin dynamics in chiral hybrid semiconductors

Abstract

Organic–inorganic hybrid semiconductors exhibit a rich interplay between their organic and inorganic sublattices, enabling precise control over electronic structure, optical anisotropy, and spin-dependent properties. A central theme in our work is the deliberate manipulation of structural symmetry and heterogeneity through organic cation engineering to regulate polarization and spin functionalities. In the first part, I will discuss our recent studies on two-dimensional mixed organic cation hybrid perovskites, where we control structural heterogeneity and lattice distortion to modulate optical anisotropy and polarization-dependent optical responses. In the second part, I will present our work on chiral hybrid semiconductors, where molecular chirality is introduced to break inversion symmetry and induce spin-selective transport. We study the mixed-chirality systems and chiral/achiral heterostructures to enhance chirality-induced spin polarization and regulate spin relaxation pathways. Together, these studies establish cation engineering and symmetry control as unifying strategies to tailor optical polarization and spin functionalities in hybrid semiconductors.