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- W2776076304 abstract "Interactions between charge carriers in graphene lead to logarithmic renormalization of observables mimicking the behavior known in (3+1)-dimensional quantum electrodynamics (QED). Here we analyze soft electron-hole $(etext{ensuremath{-}}h)$ excitations generated as a result of fast charge dynamics, a direct analog of the signature QED effect---multiple soft photons produced by the QED vacuum shakeup. We show that such excitations are generated in photon absorption, when a photogenerated high-energy $etext{ensuremath{-}}h$ pair cascades down in energy and gives rise to multiple soft $etext{ensuremath{-}}h$ excitations. This fundamental process is manifested in a double-log divergence in the emission rate of soft pairs and a characteristic power-law divergence in their energy spectrum of the form $frac{1}{ensuremath{omega}}text{ln}left(frac{ensuremath{omega}}{mathrm{ensuremath{Delta}}}right)$. Strong carrier-carrier interactions make pair production a prominent pathway in the photoexcitation cascade." @default.
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- W2776076304 date "2018-03-15" @default.
- W2776076304 modified "2023-10-17" @default.
- W2776076304 title "Soft pair excitations and double-log divergences due to carrier interactions in graphene" @default.
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- W2776076304 doi "https://doi.org/10.1103/physrevb.97.115423" @default.
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