飞秒
女性化学
光谱学
声子
材料科学
电子
联轴节(管道)
分子物理学
凝聚态物理
光电子学
化学
光学
物理
激光器
量子力学
冶金
作者
Renfan Shao,Q. Liu,W.Y. Liang,Xiao-Qing Yang,Y. B. Zhao
标识
DOI:10.1016/j.jallcom.2022.163909
摘要
The structure, transport properties, and ΔR/R ultrafast spectra of Bi2TexSe3-x crystals are studied in this work. The lattice parameter c and saturation temperature of resistance increase with increasing Te concentration. There are two electron-phonon coupling processes in Bi2TexSe3-x crystals corresponding to the interactions between two topological surface states and phonons. The electron-phonon coupling of one surface state is dominant at low temperatures (T ≤ 40 K), and the coupling of the second surface state and phonon is significant. With increasing temperature, electron-phonon coupling in bulk Bi2TexSe3−x is enhanced, which weakens electron-phonon coupling of its surface states. A small amount of Te has little effect on the electron-phonon coupling for Bi2Se3 crystals.
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