TY - JOUR

T1 - Photoinduced modulation of the excitonic resonance via coupling with coherent phonons in a layered semiconductor

AU - Mor, S

AU - Gosetti, V

AU - Molina-Sánchez, A

AU - Sangalli, D

AU - Achilli, S.

AU - Агекян, Вадим Фадеевич

AU - Franceschini, P

AU - Giannetti, C

AU - Sangaletti, L.

AU - Pagliara, S

PY - 2021/12/13

Y1 - 2021/12/13

N2 - 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

AB - 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

U2 - 10.1103/PhysRevResearch.3.043175

DO - 10.1103/PhysRevResearch.3.043175

M3 - Article

VL - 3

JO - Physical Review Research

JF - Physical Review Research

SN - 2643-1564

M1 - 043175

ER -