▎ 摘　　要

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 (e-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 e-h pair cascades down in energy and gives rise to multiple soft e-h excitations. This fundamental process ismanifested in a double-log divergence in the emission rate of soft pairs and a characteristic power-lawdivergence in their energy spectrum of the form 1/omega ln(omega/Delta). Strong carrier-carrier interactions make pair production a prominent pathway in the photoexcitation cascade.