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• W4226029035 abstract "The 1T-phase layered PtX2 chalcogenide has attracted widespread interest due to its thickness dependent metal–semiconductor transition driven by strong interlayer coupling. While the ground state properties of this paradigmatic material system have been widely explored, its fundamental excitation spectrum remains poorly understood. Here we combine first-principles calculations with momentum (q) resolved electron energy loss spectroscopy (q-EELS) to study the collective excitations in 1T-PtSe2 from the monolayer limit to the bulk. At finite momentum transfer, all the spectra are dominated by two distinct interband plasmons that disperse to higher energy with increasing q. Interestingly, the absence of long-range screening in the two-dimensional (2D) limit inhibits the formation of long wavelength plasmons. Consequently, in the small-q limit, excitations in monolayer PtSe2 are exclusively of excitonic nature, and the loss spectrum coincides with the optical spectrum. The qualitatively different momentum dependence of excitons and plasmons enables us to unambiguously disentangle their spectral fingerprints in the excited state spectrum of layered 1T-PtSe2. This will help to discern the charge carrier plasmon and locally map the optical conductivity and trace the layer-dependent semiconductor to metal transition in 1T-PtSe2 and other 2D materials." @default.
• W4226029035 created "2022-05-05" @default.
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• W4226029035 date "2022-08-01" @default.
• W4226029035 modified "2023-10-14" @default.
• W4226029035 title "Momentum-Dependent Oscillator Strength Crossover of Excitons and Plasmons in Two-Dimensional PtSe₂" @default.
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• W4226029035 doi "https://doi.org/10.1021/acsnano.2c03322" @default.
• W4226029035 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35913822" @default.
• W4226029035 hasPublicationYear "2022" @default.
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