Microscopic Description of Intraband Absorption in Graphene: The Occurrence of Transient Negative Differential Transmission
Microscopic Description of Intraband Absorption in Graphene: The Occurrence of Transient Negative Differential Transmission
We present a microscopic explanation of the controversially discussed transient negative differential transmission observed in degenerate optical pump-probe measurements in graphene. Our approach is based on the density matrix formalism allowing a time- and momentum-resolved study of carrier-light, carrier-carrier, and carrier-phonon interaction on microscopic footing. We show that phonon-assisted optical …