Effective model for studying optical properties of lead halide perovskites - Volosniev, Artem; Shiva Kumar, Abhishek; Lorenc, Dusan; Ashourishokri, Younes; Zhumekenov, Ayan; Bakr, Osman M.; Lemeshko, Mikhail; Alpichshev, Zhanybek (Physical Review B, 2023)
We use general symmetry-based arguments to construct an effective model suitable for studying optical properties of lead halide perovskites. To build the model, we identify an atomic-level interaction between electromagnetic fields and the spin degree of freedom that should be added to a minimally coupled k⋅p Hamiltonian. As a first application, we study two basic optical characteristics of the material: the Verdet constant and the refractive index. Beyond these linear characteristics of the material, the model is suitable for calculating nonlinear effects such as the third-order optical susceptibility. Analysis of this quantity shows that the geometrical properties of the spin-electric term imply isotropic optical response of the system, and that optical anisotropy of lead halide perovskites is a manifestation of hopping of charge carriers. To illustrate this, we discuss third-harmonic generation.
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