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• W2891420137 abstract "Little is known about the role of network rigidity in light-induced structural rearrangements in network glasses due to a lack of supporting experiments and theories. In this article, we demonstrate for the first time the ultrafast structural rearrangements manifested as induced absorption (IA) over a broad spectral range in a-GexAs35-xSe65 thin films above the mean-field rigidity percolation transition, quantified by the mean coordination number ⟨r⟩ = 2.40. The IA spectrum arising from self-trapped excitons induced structural rearrangements by softening the glass network that strikingly reveals two relaxation mechanisms which differ by one order of magnitude. The fast kinetics of electron-lattice interaction occurs within 1 ps, exhibits a weak dependence on rigidity, and dominates in the sub-bandgap region. In a stark contrast, the slow kinetics is associated with the structural changes in the bandgap region and depends strongly on network rigidity. Our results further demonstrate that amplitude of IA scales a linear relationship with excitation fluence which provides a unique way to induce structural rearrangements in an over-coordinated network to exploit it for practical purposes. Our results modify the conventional concept of rigidity dependence of light-induced effects in network glasses, when excited with an ultrafast laser." @default.
• W2891420137 created "2018-09-27" @default.
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• W2891420137 creator A5052289061 @default.
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• W2891420137 date "2018-09-26" @default.
• W2891420137 modified "2023-10-18" @default.
• W2891420137 title "Ultrafast light-induced softening of chalcogenide thin films above the rigidity percolation transition" @default.
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• W2891420137 doi "https://doi.org/10.1063/1.5050555" @default.
• W2891420137 hasPublicationYear "2018" @default.
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