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. 2015 Mar 17;5:9158. doi: 10.1038/srep09158

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(a) Lifshitz-Kosevich description (solid line) of the temperature dependence of the SdH amplitude. Inset: Dingle plot for the oscillations measured at 2.5 K. Solid straight line determines the Dingle temperature (see the text). (b) Landau-level fan diagram for the SdH oscillations measured at 2.5 K. Fitted straight solid line intersecting the ordinate axis at 0.4 indicates the Berry phase very close to π. Dashed (blue) line represents the fit to extrema in conductivity Δρ_xx derived with macroscopic Hall coefficient, R_H. Dot-dashed (red) line corresponds to Δσ_xx derived with Hall coefficient of surface channel R_s (see text for explanation). Inset shows the blow up of the area where the fitted lines intercept ordinate axis.