Abstract

Electron mass anisotropy in the Nb-doped anatase ${\text{TiO}}_{2}$ (TNO) was determined by polarized infrared spectroscopy measurements for (012)-oriented TNO epitaxial films. The electron mass along the $c$ axis, ${m}_{⟨001⟩}^{\ensuremath{\ast}}$, derived by Drude analyses, was found to be $0.5--3.3\text{ }{m}_{0}$, which was 3--6 times larger than that along the $a$ axis, ${m}_{⟨100⟩}^{\ensuremath{\ast}}$, $0.2--0.6\text{ }{m}_{0}$. This large anisotropy was attributed to not only the anisotropic crystal structure but also the $d$-orbital-dominated conduction band. These results indicate that control of crystallographic orientation is of crucial importance for realizing high conductivity in polycrystalline TNO films.

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