Negative dynamic Drude conductivity in pumped graphene
arXiv:1408.7023 · doi:10.7567/APEX.7.115101
Abstract
We theoretically reveal a new mechanism of light amplification in graphene under the conditions of interband population inversion. It is enabled by the indirect interband transitions, with the photon emission preceded or followed by the scattering on disorder. The emerging contribution to the optical conductivity, which we call the interband Drude conductivity, appears to be negative for the photon energies below the double quasi-Fermi energy of pumped electrons and holes. We find that for the Gaussian correlated distribution of scattering centers, the real part of the net Drude conductivity (interband plus intraband) can be negative in the terahertz and near-infrared frequency ranges, while the radiation amplification by a single graphene sheet can exceed 2.3%.
5 pages, 5 figures
References in corpus (14)
- Graphene Photonics and Optoelectronics
- Measurement of the Optical Conductivity of Graphene
- Dielectric function, screening, and plasmons in 2D graphene
- Space-time dispersion of graphene conductivity
- Measurement of Ultrafast Carrier Dynamics in Epitaxial Graphene
- Snapshots of non-equilibrium Dirac carrier distributions in graphene
- Femtosecond Population Inversion and Stimulated Emission of Dense Dirac Fermions in Graphene
- Correlated charged impurity scattering in graphene
- Voltage and temperature dependencies of conductivity in gated graphene
- Toward the creation of terahertz graphene injection laser
- Microscopic mechanism for transient population inversion and optical gain in graphene
- Nonequilibrium carriers in an intrinsic graphene under interband photoexcitation
- Threshold of Terahertz Population Inversion and Negative Dynamic Conductivity in Graphene Under Pulse Photoexcitation
- Carrier-carrier scattering and negative dynamic conductivity in pumped graphene
Cited by in corpus (4)
- Negative terahertz conductivity in disordered graphene bilayers with population inversion
- Excitonic instability in optically-pumped three-dimensional Dirac materials
- Edge currents driven by terahertz radiation in graphene in quantum Hall regime
- Theory of the effective Seebeck coefficient for photoexcited 2D materials: the case of graphene