In this work we uncover an interesting quantum plateau behavior for the
Andreev reflection between a one-dimensional quantum wire and superconductor.
The quantum plateau is achieved by properly tuning the interplay of the
spin-orbit coupling within the quantum wire and its tunnel coupling to the
superconductor. This plateau behavior is justified to be unique by excluding
possible existences in the cases associated with multi-channel quantum wire,
the Blonder-Tinkham-Klapwijk continuous model with a barrier, and lattice
system with on-site impurity at the interface.Comment: 6 pages, 3 figures
