  We present analysis of the interacting quantum wire problem in the presence
of magnetic field and spin-orbit interaction. We show that an interesting
interplay of Zeeman and spin-orbit terms, facilitated by the electron-electron
interaction, results in the spin-density wave (SDW) state when the magnetic
field and spin-orbit axes are orthogonal. This strongly affects charge
transport through the wire: with SDW stabilized, single particle backscattering
off an nonmagnetic impurity becomes irrelevant. Sensitivity of the effect to
the direction of the magnetic field can be used for experimental verification
of this proposal.
