Can I read Effect of Photoinduced Screening on the Spectroscopic Signature of Exciton-phonon Coupling on EtoBox?

Effect of Photoinduced Screening on the Spectroscopic Signature of Exciton-phonon Coupling by Mor, Selene; Gosetti, Valentina; Agekyan, Vadim F.; Giannetti, Claudio; Sangaletti, Luigi; Pagliara, Stefania is a scholarly article available to read on EtoBox.

What is Effect of Photoinduced Screening on the Spectroscopic Signature of Exciton-phonon Coupling about?

The light-mediated interaction of fermionic and bosonic excitations governs the optoelectronic properties of condensed matter systems. In photoexcited semiconductors, the coupling of electron-hole pairs (excitons) to coherent optical phonons enables a modulation of the excitonic resonance that is phase-locked to the frequency of the coupled vibrational mode. Moreover, due to the Coulombic nature of excitons, their dynamics are sensitive to transient changes in the screening by the photoexcited carriers. Interestingly, the effect of photoinduced screening on the transient optical signal originating from the exciton dynamics coupled to phonons is not yet established. By means of broadband transient reflectance spectroscopy, we disclose how exciton-phonon coupling manifests in either presence or absence of dynamical screening in a layered semiconductor. Further, we unveil the promoting role of photoinduced screening on these exciton-phonon coupled dynamics as opposed to the case in which the unscreened exciton-exciton repulsion likely dominates the nonequilibrium optical response. These findings set a protocol to look at an excitonic resonance and its fundamental many-body interaction

Author

Mor, Selene; Gosetti, Valentina; Agekyan, Vadim F.; Giannetti, Claudio; Sangaletti, Luigi; Pagliara, Stefania

Published

2024

Language

EN