| Issue |
J. Eur. Opt. Society-Rapid Publ.
Volume 20, Number 2, 2024
|
|
|---|---|---|
| Article Number | 38 | |
| Number of page(s) | 5 | |
| DOI | https://doi.org/10.1051/jeos/2024041 | |
| Published online | 15 November 2024 | |
Research Article
Anisotropy of coherent phonon in Bismuth crystal
Laboratoire d’Optique Appliquée, ENSTA Paris, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, 91761 Palaiseau, France
* Corresponding author: davide.boschetto@ensta.fr
Received:
6
September
2024
Accepted:
11
October
2024
In this article, we investigate the coherent A1g phonon mode in bismuth crystal using transient reflectivity measurements, focusing on two distinct crystallographic orientations: one with the principal axis ((1 1 1)-direction in the trigonal cell representation) perpendicular to the sample surface, and the other with the principal axis parallel to the surface. Our results demonstrate significant variations in the amplitude, frequency, and lifetime of the coherent phonon mode between these two orientations, even when identical pumping and probing conditions are applied. We attribute these differences to the anisotropy of the electron effective mass, which influences electron mobility and, in turn, affects the phonon dynamics in bismuth.
Key words: Coherent phonon / Pump/probe experiment / Ultrafast transient reflectivity / Bismuth / Anisotropy / Phonon dynamics
© The Author(s), published by EDP Sciences, 2024
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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