Field Tunable Normal and Hybrid Spin Texture of Halide Perovskites

Hybrid organic-inorganic halide perovskites (HOIP) are discovered to be the promising class of materials for optoelectronics, and spinorbitronics due to the presence of strong spin-orbit coupling and spontaneous ferroelectric polarization. Here, we develop a model Hamiltonian to describe the electronic structure and spin texture of HOIP. The Hamiltonian takes into account the electron hopping, spin-orbit coupling, and the effect of the polarized field. From the results, we infer that the spin texture is far more sensitive to the polarized field and can be served as a fingerprint for the HOIPs.The formation of cusp and nodes in the spin texture spanned across the Brillouin zones well as possible hybridization in the spin texture, driven through band inversion, can give rise to a unique spin transport phenomena in these perovskites. Furthermore, we will see the polarized field can lead to first order normal to topological phase transition and can create unconventional topological phases in the form of Dirac circles and arches. We support our findings with density functional calculations.