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Recent advances in electron spin resonance techniques have allowed themanipulation of the spin of individual atoms, making magnetic atomic chains onsuperconducting hosts one of the most promising platform where topologicalsuperconductivity can be engineered. Motivated by this progress, we provide adetailed, quantitative description of the effects of manipulating spins inrealistic nanowires by applying a first-principles-based computational approachto a recent experiment: an iron chain deposited on top of Au/Nbheterostructure. As a continuation of the first part of the paperexperimentally relevant computational experiments are performed in spin spiralchains that shed light on several concerns about practical applications and addnew aspects to the interpretation of recent experiments. We explore thestability of topological zero energy states, the formation and distinction oftopologically trivial and non-trivial zero energy edge states, the effect oflocal changes in the exchange fields, the emergence of topologicalfragmentation, and the shift of Majorana Zero Modes along the superconductingnanowires opening avenues toward the implementation of a braiding operation.

Topological superconductivity from first-principles II: Effects from  manipulation of spin spirals $-$ Topological fragmentation, braiding, and  Quasi-Majorana Bound States