Figure 5
From: Dual evidence of surface Dirac states in thin cylindrical topological insulator Bi2Te3 nanowires
Panel (a) show the variations of the resistance, ΔR, vs. 1/H⊥ after the subtraction of a fitted smooth background at different T.
If defining the minima, together with the tiny kinks resolved at 0.2 K, as marked specifically by the dashed lines, the R-oscillations display a periodic behavior with 1/ H⊥ in high field regime, an indicative of the SdH oscillations. Another set of SdH oscillations with a large periodicity was indicated by the thin solid lines. In panel (b), curve (A) plots the integer LL index, n (open squares) vs. 1/ H⊥ at the minima or kinks of the SdH spectrum. The data defined from the maxima are also shown additionally in the plot as the solid squares (shifted by 1/2 in LL index). The best-fit straight line intercepts the n-axis at the value of γ = −0.41 ± 0.1, almost at the ideal value of γ = −1/2 for Dirac spectrum. Curve (B) plots the integer LL index, n (open squares) vs. 1/ H⊥ for another set of SdH spectrum in low-H regime. Clearly, the best-fit straight line passes exactly through the zero point of the n-axis with the ideal value γ = 0.
