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Bulk hybride halide perovskites are governed by significant Rashba andDresselhaus splitting. This indicates that such effects will not only affecttheir optoelectronic properties but also those of their two dimensional layeredrelatives. This work aims at understanding how different ways of symmetrybreaking influence these effects in those materials. For this purpose, modelstructures are adopted where the organic compounds are replaced by Cs atoms.Disregarding possible distortions in the inorganic layers, results instructures with composition Cs$_{n+1}$Pb$_n$I$_{3n+1}$. Using the all-electronfull-potential density-functional-theory code \texttt{exciting}, the impact ofatomic displacement on the band structure is systematically studied for $n=1$,2, 3 and $\infty$. The displacement patterns that yield Rashba or Dresselhaussplitting are identified, and the amount of the splitting is determined as afunction of displacement. Furthermore, the spin textures in the electronicstates around the band gap are analyzed to differentiate between Rashba andDresselhaus effects. This study reveals in-plane Pb displacements as the originof the strongest effects.

Rashba and Dresselhaus effects in 2D Pb-I-based perovskites