Electronic states and spin-filter effect in three-dimensional topological insulator Bi<sub>2</sub>Se<sub>3</sub> nanoribbons

Electronic states and spin-filter effect in three-dimensional topological insulator Bi₂Se₃ nanoribbons

Liu Genhua^{1, 2, †}, Xiao Pingguo¹, Xu Piaorong¹, Zhou Huiying¹, Zhou Guanghui²

(color online) Contour plot of the density distributions of the electron states (n = 1) for square cross sections of Bi₂Se₃ nanoribbons with (a) 5, (b) 7, (c) 10, (d) 20, (e) 40, (f) 60, (g) 80, and (h) 100 nm. and stand for spin-up and -down surface states, respectively.