Negative dynamic conductivity of graphene with optical pumping
- 15 April 2007
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 101 (8), 083114
- https://doi.org/10.1063/1.2717566
Abstract
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.Keywords
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