Negative differential transmission in graphene
arXiv:1308.0866 · doi:10.1103/PhysRevB.88.235422
Abstract
By using the Kubo linear response theory with the Keldysh Green function approach, we investigate the mechanism leading to the negative differential transmission in system with the equilibrium electron density much smaller than the photon-excited one. It is shown that the negative differential transmission can appear at low probe-photon energy (in the order of the scattering rate) or at high energy (much larger than the scattering rate). For the low probe-photon energy case, the negative differential transmission is found to come from the increase of the intra-band conductivity due to the large variation of electron distribution after the pumping. As for the high probe-photon energy case, the negative differential transmission is shown to tend to appear with the hot-electron temperature being closer to the equilibrium one and the chemical potential higher than the equilibrium one but considerably smaller than half of the probe-photon energy. We also show that this negative differential transmission can come from both the inter- and the intra-band components of the conductivity. Especially, for the inter-band component, its contribution to the negative differential transmission is shown to come from both the Hartree-Fock self-energy and the scattering. Furthermore, the influence of the Coulomb-hole self-energy is also addressed.
10 pages, 3 figures
References in corpus (20)
- The electronic properties of graphene
- Chiral tunneling and the Klein paradox in graphene
- Optical properties of graphene
- Dynamical polarization of graphene at finite doping
- Colloquium: The transport properties of graphene: An introduction
- Photo-excitation Cascade and Multiple Carrier Generation in Graphene
- Ultrafast collinear scattering and carrier multiplication in graphene
- Measurement of the Optical Absorption Spectra of Epitaxial Graphene from Terahertz to Visible
- Quantum-critical relativistic magnetotransport in graphene
- Impact of Auger processes on carrier dynamics in graphene
- Cooling of photoexcited carriers in graphene by internal and substrate phonons
- The quasiparticle spectral function in doped graphene
- Physical origin of satellite in photoemission of doped graphene: An ab-initio GW plus cumulant study
- Microscopic mechanism for transient population inversion and optical gain in graphene
- Coulomb interacting Dirac fermions in disordered graphene
- Spatially resolved pump-probe study of single-layer graphene produced by chemical vapor deposition
- Effects of optical and surface polar phonons on the optical conductivity of doped graphene
- Microscopic theory of ultrafast dynamics of carriers photoexcited by THz and near-infrared linearly-polarized laser pulses in graphene
- Quasi-equilibrium optical nonlinearities in spin-polarized GaAs
- Broadband electromagnetic response and ultrafast dynamics of few-layer epitaxial graphene