Cold unmagnetized plasma waves carry the same nontrivial R/L topology as photons, their angular momentum eigenstates are spin-weighted spherical harmonics, and no true spin-orbital decomposition of the angular momentum exists.
Thus, we find 20 that S = 0 and therefore there is no nontrivial SAM-OAM decomposition
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The topology, geometry, and angular momentum of cold plasma waves
Cold unmagnetized plasma waves carry the same nontrivial R/L topology as photons, their angular momentum eigenstates are spin-weighted spherical harmonics, and no true spin-orbital decomposition of the angular momentum exists.