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- W2022193816 abstract "Significant excitonic effects were observed in graphene by measuring its optical conductivity in a broad spectral range including the two-dimensional {pi}-band saddle-point singularities in the electronic structure. The strong electron-hole interactions manifest themselves in an asymmetric resonance peaked at 4.62 eV, which is red-shifted by nearly 600 meV from the value predicted by ab-initio GW calculations for the band-to-band transitions. The observed excitonic resonance is explained within a phenomenological model as a Fano interference of a strongly coupled excitonic state and a band continuum. Our experiment also showed a weak dependence of the excitonic resonance in few-layer graphene on layer thickness. This result reflects the effective cancellation of the increasingly screened repulsive electron-electron (e-e) and attractive electron-hole (e-h) interactions." @default.
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- W2022193816 date "2011-01-25" @default.
- W2022193816 modified "2023-10-13" @default.
- W2022193816 title "Seeing Many-Body Effects in Single- and Few-Layer Graphene: Observation of Two-Dimensional Saddle-Point Excitons" @default.
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- W2022193816 doi "https://doi.org/10.1103/physrevlett.106.046401" @default.
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