  We suggest a single-mode spin injection scheme in non-ferromagnetic quantum
channels utilizing perpendicular strong Rashba spin-orbit and Zeeman fields. By
applying a positive top-gate potential in order to inject electrons from the
spin-orbit gap to the low-energy regime, we observe coherent destruction of
transport signatures of a hole-like quasi-bound state, an electron-like
quasi-bound state, or a hole-like bound state features that are sensitive to
the selection of the top-gate length along the transport direction.
