Photoinduced modulation of the excitonic resonance via coupling with coherent phonons in a layered semiconductor

Selene Mor, Valentina Gosetti, A. Molina-Sánchez, D. Sangalli, S. Achilli, Simona Achilli, V. F. Agekyan, Paolo Franceschini, Claudio Giannetti, Luigi Ermenegildo Sangaletti, Stefania Pagliara*

*Autore corrispondente per questo lavoro

Risultato della ricerca: Contributo in rivistaArticolo in rivistapeer review


The coupling of excitons with atomic vibrations plays a pivotal role on the nonequilibrium optical properties of layered semiconductors. However, how exciton-phonon coupling manifests in the time and energy domains is still an open debate between experiment and theory. By means of time-resolved broadband optical reflectivity combined with ab initio calculations of a bismuth tri-iodide single crystal, we set the spectral fingerprints for the optical detection of exciton-phonon coupling in layered semiconductors. Our joint experimental and theoretical effort allows us to unravel the impact of exciton-phonon coupling by microscopically relating the photoinduced coherent energy modulation of the excitonic resonance to coherent optical phonons. This enables us to track 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.
Lingua originaleEnglish
pagine (da-a)N/A-N/A
RivistaPhysical Review Research
Stato di pubblicazionePubblicato - 2021


  • coherent phonon
  • exciton-phonon coupling
  • layered semiconductor
  • time-resolved spectroscopy


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