  The persistent spin helix (PSH) that has been widely and exclusively studied
in zinc-blende structures is revealed for the first time on the surface of a
wurtzite structure. Through first-principles calculations of the ZnO(10-10)
surface, a quasi-one dimensional orientation of the spin textures is
identified. Further, the wavelength of this particular PSH is smaller than that
observed with various zinc-blende quantum well structures, thus indicating that
wurtzite-structured surfaces are suitable for spintronics applications.
