Comment on “Effect of spin-orbit interaction on the plasma excitations in a quantum wire”

Abstract

We comment on the recent results Phys. Rev. B 70, 235314 2004 showing the dispersion relations of single-particle and collective excitations in quantum wires in the presence of the Rashba spin-orbit interaction SOI . We claim that those calculations performed in the absence of SOI, and used as a strong reference to the interacting case, are unlikely to be correct. We show the correct -q plane of the system in the absence of Rashba SOI.