論文

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
  • Yuta Komori
  • ,
  • Yuta Saito
  • ,
  • Paul Fons
  • ,
  • Muneaki Hase

23
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
DOI
https://doi.org/10.1088/1367-2630/abe2c0
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000620490800001&DestApp=WOS_CPL
ID情報
  • DOI : 10.1088/1367-2630/abe2c0
  • ISSN : 1367-2630
  • ORCIDのPut Code : 88080026
  • Web of Science ID : WOS:000620490800001

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