TY - JOUR
T1 - Photoinduced modulation of the excitonic resonance via coupling with coherent phonons in a layered semiconductor
AU - Mor, Selene
AU - Gosetti, Valentina
AU - Molina-Sánchez, A.
AU - Sangalli, D.
AU - Achilli, S.
AU - Achilli, Simona
AU - Agekyan, V. F.
AU - Franceschini, Paolo
AU - Giannetti, Claudio
AU - Sangaletti, Luigi Ermenegildo
AU - Pagliara, Stefania
PY - 2021
Y1 - 2021
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.
KW - coherent phonon
KW - exciton-phonon coupling
KW - layered semiconductor
KW - time-resolved spectroscopy
KW - coherent phonon
KW - exciton-phonon coupling
KW - layered semiconductor
KW - time-resolved spectroscopy
UR - http://hdl.handle.net/10807/196722
UR - https://arxiv.org/abs/2105.12587
U2 - 10.1103/PhysRevResearch.3.043175
DO - 10.1103/PhysRevResearch.3.043175
M3 - Article
SN - 2643-1564
VL - 3
SP - N/A-N/A
JO - Physical Review Research
JF - Physical Review Research
ER -