  Quantum spin Hall insulators have attracted significant attention in recent
years. Understanding the optical properties and spin Hall effect in these
materials is crucial for technological advancements. In this study, we present
theoretical analyses to explore the optical properties, Berry curvature and
spin Hall conductivity of perturbed and pristine PbBiI using the linear
combination of atomic orbitals and the Kubo formula. Our calculations reveal
that the electronic structure can be modified using staggered exchange fields
and electric fields, leading to changes in the optical properties.
Additionally, spin Berry curvature and spin Hall conductivity are investigated
in terms of various parameters. The results indicate that due to the small
dynamical spin Hall conductivity, generating an ac spin current in PbBiI
requires the use of external magnetic fields or magnetic materials.
