Figure 7.

Transport data of ${\mathrm{Bi}}_2{\mathrm{Se}}_3$ thin films against thickness: (a) conductance, (b) carrier density, (c) mobility. The solid straight lines are guides for the eyes. The subscript ${\mathrm{SC}}_1$ corresponds to the topological surface states whereas the subscript ${\mathrm{SC}}_2$ corresponds to the 2DEG. (d) Magnetoconductance for different thicknesses. (e) ${\mathrm{l}}_{\mathsf{\phi }}$ against thickness. (f) $\mathsf{\alpha }$ against thickness. Insets in (a), (b), and (c) show the data for thinner films. Reprinted with permission from Reference [64]. Copyright 2012 American Physical Society.