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Correlation satellites in optical and loss spectra

Abstract : Coupling of excitations leads to intriguing effects on the spectra of materials. We propose a cumulant formulation for neutral electronic excitations which opens the way to describe effects such as double plasmon satellites or exciton-exciton coupling. Our approach starts from the GW + Bethe-Salpeter approximation to many-body perturbation theory which is based on a quasiparticle picture, and it adds coupling of excitations through a consistent inclusion of dynamically screened interactions. This requires one to consider scattering contributions that are usually neglected. The result is formulated in a way that highlights essential physics, that can be implemented as a postprocessing tool in first-principles codes, and that suggests which kind of materials and measurements should exhibit strong effects. This is illustrated using a model.
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https://hal.archives-ouvertes.fr/hal-03098565
Contributor : Lucia Reining <>
Submitted on : Tuesday, January 5, 2021 - 6:43:00 PM
Last modification on : Tuesday, July 6, 2021 - 3:19:43 AM
Long-term archiving on: : Wednesday, April 7, 2021 - 9:27:11 AM

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PhysRevResearch.2.012032.pdf
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Pierluigi Cudazzo, Lucia Reining. Correlation satellites in optical and loss spectra. Physical Review Research, American Physical Society, 2020, 2 (1), ⟨10.1103/PhysRevResearch.2.012032⟩. ⟨hal-03098565⟩

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