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arXiv · 2105.12587

Photoinduced coherent modulation of an excitonic resonance via coupling with coherent optical phonons

Selene Mor·Valentina Gosetti·Alejandro Molina-Sánchez·Davide Sangalli·Simona Achilli·Vadim. F. Agekyan·Paolo Franceschini·Claudio Giannetti·Luigi Sangaletti·Stefania Pagliara
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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.

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Selene Mor, Valentina Gosetti, Alejandro Molina-Sánchez, Davide Sangalli, Simona Achilli, Vadim. F. Agekyan, Paolo Franceschini, Claudio Giannetti, Luigi Sangaletti, Stefania Pagliara. 2021-05-26. Photoinduced coherent modulation of an excitonic resonance via coupling with coherent optical phonons. https://doi.org/10.1103/physrevresearch.3.043175

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