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- W2592318689 abstract "Molecules with ${C}_{N}$ or ${C}_{Nh}$ symmetry can absorb quanta of optical angular momentum to generate twisted excitons with well-defined quasiangular momenta of their own. Angular momentum is conserved in such interactions at the level of a paraxial approximation for the light beam. A sequence of absorption events can thus be used to create a range of excitonic angular momenta. Subsequent decay can produce radiation with a single angular momentum equal to that accumulated. Such molecules can thus be viewed as mediators for changing the angular momentum of light. This sidesteps the need to exploit nonlinear light-matter interactions based on higher-order susceptibilities. A tight-binding paradigm is used to verify angular momentum conservation and demonstrate how it can be exploited to change the angular momentum of light. The approach is then extended to a time-dependent density functional theory setting where the key results are shown to hold in a many-body, multilevel setting." @default.
- W2592318689 created "2017-03-16" @default.
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- W2592318689 date "2017-07-11" @default.
- W2592318689 modified "2023-10-18" @default.
- W2592318689 title "Twisted molecular excitons as mediators for changing the angular momentum of light" @default.
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- W2592318689 doi "https://doi.org/10.1103/physreva.96.013819" @default.
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