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- W4207068920 abstract "Topological insulators with their inherent surface states are highly promising quantum materials. This article reports the evolution of the topological surface states by low-temperature transport measurements through magnetoresistance and the femtosecond transient reflectance ultrafast spectroscopy (TRUS) on single-crystalline topological insulators, Bi 2 Te 3 and Sb 2 Te 3 . The weak anti-localization (WAL) effect was observed in the magnetoresistance measurement, showing the presence of topological surface states at low temperatures. The TRUS at different temperatures, varying from room temperature (300 K) to a low temperature of 5 K, was also performed to observe the behaviour of the charge carrier dynamics, and interestingly, the evolution of the topological surface states have been observed. The coherent optical and acoustic phonons have been evaluated with respect to the temperature variation. In addition, the various transitions are also modeled with the help of band structures. • The WAL effect is confirmed by the magnetoresistance measurement, which reveals the presence of TSS in both samples. • The low-temperature TRUS is used to demonstrate the existence of dominant surface states. • The temperature dependency of phonon modes in bismuth telluride and antimony telluride has also been established. • Due to enhanced carriers in the surface conduction channel, the charge carrier dynamics indicates the transition from it. • Studying TIs at low temperatures reveals the evolution of TSS-related transitions ." @default.
- W4207068920 created "2022-01-26" @default.
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- W4207068920 date "2022-03-01" @default.
- W4207068920 modified "2023-09-29" @default.
- W4207068920 title "Temperature-dependent evolution of topological surface states" @default.
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- W4207068920 doi "https://doi.org/10.1016/j.solidstatesciences.2022.106829" @default.
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