Photoinduced coherent modulation of an excitonic resonance via coupling with coherent optical phonons
Abstract
The coupling of excitons with atomic vibrations plays a pivotal role on the nonequilibrium optical properties of layered semiconductors. However, addressing the dynamical interaction between excitons and phonons represents a hard task both experimentally and theoretically. By means of time-resolved broadband optical reflectivity combined with state-of-the-art ab-initio calculations of a bismuth triiodide single crystal, we unravel the universal spectral fingerprints of exciton--phonon coupling in layered semiconductors. Furthermore, we microscopically relate a photoinduced coherent energy modulation of the excitonic resonance to coherent optical phonons, thereby tracking the extent of the photoinduced atomic displacement in real-space. Our findings represent a step forward on the road to coherent manipulation of the excitonic properties on ultrafast timescales.
Keywords
Cite
@article{arxiv.2105.12587,
title = {Photoinduced coherent modulation of an excitonic resonance via coupling with coherent optical phonons},
author = {Selene Mor and Valentina Gosetti and Alejandro Molina-Sánchez and Davide Sangalli and Simona Achilli and Vadim. F. Agekyan and Paolo Franceschini and Claudio Giannetti and Luigi Sangaletti and Stefania Pagliara},
journal= {arXiv preprint arXiv:2105.12587},
year = {2022}
}