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Journal Article

Reconstruction of ultrafast exciton dynamics with a phase-retrieval algorithm


Sato,  S.
Center for Computational Sciences, University of Tsukuba;
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Dolso, G. L., Moio, B., Inzani, G., Di Palo, N., Sato, S., Borrego-Varillas, R., et al. (2022). Reconstruction of ultrafast exciton dynamics with a phase-retrieval algorithm. Optics Express, 30(8), 12248-12267. doi:10.1364/OE.451759.

Cite as: https://hdl.handle.net/21.11116/0000-000A-5D85-8
The first step to gain optical control over the ultrafast processes initiated by light in solids is a correct identification of the physical mechanisms at play. Among them, exciton formation has been identified as a crucial phenomenon which deeply affects the electro-optical properties of most semiconductors and insulators of technological interest. While recent experiments based on attosecond spectroscopy techniques have demonstrated the possibility to observe the early-stage exciton dynamics, the description of the underlying exciton properties remains non-trivial. In this work we propose a new method called extended Ptychographic Iterative engine for eXcitons (ePIX), capable of reconstructing the main physical properties which determine the evolution of the quasi-particle with no prior knowledge of the exact relaxation dynamics or the pump temporal characteristics. By demonstrating its accuracy even when the exciton dynamics is comparable to the pump pulse duration, ePIX is established as a powerful approach to widen our knowledge of solid-state physics.