Figure 9

Angular dependence of the SdH oscillations from sidewall surface states at large angle θ.

(a) Scheme of the cross-section view of the Bi₂Se₃ nanoplate for illustrating the angle α between the top surface and the side-wall and the angle θ between the direction of the magnetic field B and the direction perpendicular to the substrate plane. (b) The evolution of the SdH oscillations as the magnetic field deflects from in-plane direction, i.e. from θ = 90° to θ = 60°. (c) Plot of the peak positions at n = 6 and 7 versus the tilted angle θ, a fitting to 1/cos(θ − α) obtaining α = 56°, in agreement with the HAADF-STEM results.