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We report the electric transport study of the three-dimensional topologicalinsulator TlBiSe$_2$. We applied a newly developed analysis procedure andprecisely determined two-carrier transport properties. Magnetotransportproperties revealed a multicarrier conduction of high- and low-mobilityelectrons in the bulk, which was in qualitative agreement with angle-resolvedphotoemission results~[K. Kuroda $et~al.$, Phys. Rev. Lett. $\bm{105}$, 146801(2010)]. The temperature dependence of the Hall mobility was explained wellwith the conventional Bloch-Gr{\"u}neisen formula and yielded the Debyetemperature $\varTheta_{\rm{D}}=113 \pm 14$~K. The results indicate that thescattering of bulk electrons is dominated by acoustic phonons.

Precise determination of two-carrier transport properties in the topological insulator TlBiSe$_2$