Figure 3.

(a,b) The ${\rho }_{xx}\left(B\right)$ and ${\rho }_{yx}\left(B\right)$ curves of device A, where ${\rho }_{xx}\left(B\right)$ was measured using electrodes #3 and #4, and ${\rho }_{yx}\left(B\right)$ was measured using electrodes #3 and #12. High-field ${\sigma }_{xx}\left(B\right)$ data obtained using ${\sigma }_{xx}={\rho }_{xx}/({\rho }_{xx}^2+{\rho }_{yx}^2)$, showing clear SdH oscillations. (c) The background of classical magnetoconductivity was obtained by smoothing the ${\sigma }_{xx}\left(B\right)$ curve, as shown by the red line in the figure. (d) The $∆{\sigma }_{xx}$ data obtained by subtracting the background, plotted against $1/B$. (e) Landau fan diagram plotted using the minima of oscillations in (d). A linear fit to the data gives a zero intercept and a slope of 155 T. Inset: schematic diagram of the elliptical bulk Fermi surface of Bi₂Se₃.