Antiferromagnetically coupled helimagnetic chains preserve p-wave spin polarization under Rashba spin-orbit coupling for any helix period, while single chains only do so for even periods.
With spin-split bands, a polarization in x is not permitted and it thus has to vanish as the system gradually becomes more ferromagnetic like
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The fate of $p$-wave spin polarization in helimagnets with Rashba spin-orbit coupling
Antiferromagnetically coupled helimagnetic chains preserve p-wave spin polarization under Rashba spin-orbit coupling for any helix period, while single chains only do so for even periods.