Bulk and surface terahertz conductivity of Bi2−xSbxTe3−ySey topological insulatorsстатья
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Дата последнего поиска статьи во внешних источниках: 12 января 2022 г.
Аннотация:Complex conductivity of the topological insulator (TI) Bi2−xSbxTe3−ySey samples of various thicknesses and chemical compositions is studied by terahertz time-domain spectroscopymethod in the range 0.5 to 2.5 THz. For the first time, a decrease in conductivity in the terahertzrange has been observed as the chemical composition approaches the Ren’s curve. The generalized approximate expressions are obtained for complex conductivity with account of the lowest E1u-phonon mode. Calculations of the Fermi energy and concentration of bulk carriers are performed. Based on the experimental data, an estimate of conductance of the topological states is obtained. The results can be useful in developing terahertz devices based on the specific surfacetransport in TIs.