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Topological insulators (TIs) are widely recognized as a new state of quantum matter with semiconductor‐like or insulator‐like bulk states (BSs) and Dirac‐like surface states (SSs). Herein, the terahertz (THz) properties of the SSs and BSs in Bi2Te3‐based TIs, as well as the effects of temperature on them, are examined. By using THz time–domain spectroscopy, the optical conductance of Bi2Te3 is obtained...