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

Abstract

We report the electric transport study of the three-dimensional topological insulator TlBiSe${}_2$. We applied a newly developed analysis procedure and precisely determined two-carrier transport properties. Magnetotransport properties revealed a multicarrier conduction of high- and low-mobility electrons in the bulk, which was in qualitative agreement with angle-resolved photoemission results~[K. Kuroda $etal.$, Phys. Rev. Lett. $105$, 146801 (2010)]. The temperature dependence of the Hall mobility was explained well with the conventional Bloch-Gr{ü}neisen formula and yielded the Debye temperature ${\Theta }_{\mathrm{D}}=113\pm 14$~K. The results indicate that the scattering of bulk electrons is dominated by acoustic phonons.

6 pages, 5 figures, to be published in Physical Review B