In my knowledge, near all of the publications say the spin obtial coupling originates from the moving of a spin electron relative to a atom, and there are two mechanisms to induce SOC, i.e. the Rashba effect and the Dressalhaus effect. They are in the relation with the breaking of structure inversion symmetry either in macroscopy like a interface or in a crystal. I would like to know if the SOC could form if the Rashba effect and Dressalhaus effect were eliminated? In my idea, that is not excluded by the SOC origination principle.
Yes, you will find that spin orbit coupling is an important ingredient to calculating the correct band dispersions in many materials or to understand the optical properties of semiconductors.
One special feature of Rashba coupling, for example, is to remove the spin degeneracy in surface states. So, instead of the Fermi surface in 2D do be a spin degenerate ring, there are two concentric rings.
It actually depends on the system. SOC is important but will have manifest effect only for heavy atoms.
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