Negative dynamic conductivity of graphene with optical pumping

V. Ryzhii, M. Ryzhii, T. Otsuji

Research output: Contribution to journalArticlepeer-review

349 Citations (Scopus)


We study the dynamic ac conductivity of a nonequilibrium two-dimensional electron-hole system in optically pumped graphene. Considering the contribution of both interband and intraband transitions, we demonstrate that at sufficiently strong pumping the population inversion in graphene can lead to the negative net ac conductivity in the terahertz range of frequencies. This effect might be used in graphene-based coherent sources of terahertz radiation.

Original languageEnglish
Article number083114
JournalJournal of Applied Physics
Issue number8
Publication statusPublished - 2007


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