Ultrafast scattering dynamics of coherent phonons in Bi1-x Sbx in the Weyl semimetal phase

Yuta Komori, Yuta Saito, Paul Fons, Muneaki Hase

研究成果: Article査読

1 被引用数 (Scopus)

抄録

We investigate ultrafast phonon dynamics in the Bi1-x Sb x alloy system for various compositions x using a reflective femtosecond pump-probe technique. The coherent optical phonons corresponding to the A1g 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.

本文言語English
論文番号023034
ジャーナルNew Journal of Physics
23
2
DOI
出版ステータスPublished - 2021 2

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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