2021年2月1日
Ultrafast scattering dynamics of coherent phonons in Bi1−x Sb x in the Weyl semimetal phase
New Journal of Physics
- ,
- ,
- ,
- 巻
- 23
- 号
- 2
- 開始ページ
- 023034
- 終了ページ
- 023034
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1088/1367-2630/abe2c0
- 出版者・発行元
- {IOP} Publishing
We investigate ultrafast phonon dynamics in the Bi1-xSbx alloy system for various compositions x using a reflective femtosecond pump-probe technique. The coherent optical phonons corresponding to the A(1g) local vibrational modes of Bi-Bi, Bi-Sb, and Sb-Sb are generated and observed in the time domain with a few picoseconds dephasing time. The frequencies of the coherent optical phonons were found to change as the Sb composition x was varied, and more importantly, the relaxation time of those phonon modes was dramatically reduced for x values in the range 0.5-0.8. We argue that the phonon relaxation dynamics are not simply governed by alloy scattering, but are significantly modified by anharmonic phonon-phonon scattering with implied minor contributions from electron-phonon scattering in a Weyl-semimetal phase.
- リンク情報
- ID情報
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- DOI : 10.1088/1367-2630/abe2c0
- ISSN : 1367-2630
- ORCIDのPut Code : 88080026
- Web of Science ID : WOS:000620490800001