首页|Detecting surface-state-dominated electron-phonon coupling in Bi2TexSe3?x crystals at low temperatures by femtosecond transient optical spectroscopy

Detecting surface-state-dominated electron-phonon coupling in Bi2TexSe3?x crystals at low temperatures by femtosecond transient optical spectroscopy

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  • NSTL
  • Elsevier
? 2022 Elsevier B.V.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.

Electron-phonon couplingFemtosecond transient optical spectroscopyTopological insulators

Liu Q.Y.、Yang X.S.、Zhao Y.、Liang W.Z.、Shao R.H.

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Superconductivity and New Energy R&D Center School of Physical Science and Technology Southwest Jiaotong University

School of Materials Science and Engineering Southwest Jiaotong University

2022

10.1016/j.jallcom.2022.163909

Journal of Alloys and Compounds

Journal of Alloys and Compounds

EISCI
ISSN：0925-8388
年,卷(期)：2022.903
  • 32