“…As for one-dimensional models, quantum graph is very effective in this situation (see, e.g., [15][16][17]). Particularly, to ensure the spin filtering, spin flip, control of the spin transport one uses, usually, systems of coupled quantum rings (see, e.g., [14,[18][19][20][21][22][23][24][25][26][27]). In the present paper, we show an example of the spin-flip in 1D system without rings for the Hamiltonian with spin-orbit interaction.…”