Observation of Intra- and Inter-band Transitions in the Optical Response of Graphene
arXiv:1104.3104 · doi:10.1088/1367-2630/15/1/015009
Abstract
The optical conductivity of freely suspended graphene was examined under non-equilibrium conditions using femtosecond pump-probe spectroscopy. We observed a conductivity transient that varied strongly with the electronic temperature, exhibiting a crossover from enhanced to decreased absorbance with increasing pump fluence. The response arises from a combination of bleaching of the inter-band transitions by Pauli blocking and induced absorption from the intra-band transitions of the carriers. The latter dominates at low electronic temperature, but, despite an increase in Drude scattering rate, is overwhelmed by the former at high electronic temperature. The time-evolution of the optical conductivity in all regimes can described in terms of a time-varying electronic temperature.
10 pages (4 pages manuscript + Supplemental Info.)
References in corpus (27)
- The electronic properties of graphene
- Universal Dynamic Conductivity and Quantized Visible Opacity of Suspended Graphene
- Graphene Photonics and Optoelectronics
- Measurement of the Optical Conductivity of Graphene
- Temperature dependent transport in suspended graphene
- Hot Carrier-Assisted Intrinsic Photoresponse in Graphene
- Colloquium: The transport properties of graphene: An introduction
- Space-time dispersion of graphene conductivity
- Electronic transport in graphene: A semi-classical approach including midgap states
- Drude Conductivity of Dirac Fermions in Graphene
- Non-adiabatic Kohn-anomaly in a doped graphene monolayer
- Probing the Intrinsic Properties of Exfoliated Graphene: Raman Spectroscopy of Free-Standing Monolayers
- Ultrafast Photoluminescence from Graphene
- Dual-gated bilayer graphene hot electron bolometer
- Phonon anharmonicities in graphite and graphene
- Seeing many-body effects in single- and few-layer graphene: Observation of two-dimensional saddle-point excitons
- Carrier dynamics in epitaxial graphene close to the Dirac point
- Carrier Multiplication in Graphene
- Impact of the electron-electron correlation on phonon dispersions: failure of LDA and GGA functionals in graphene and graphite
- Screening induced temperature dependent transport in 2D graphene
- Impact of Auger processes on carrier dynamics in graphene
- Inelastic carrier lifetime in graphene
- Conductivity of suspended and non-suspended graphene at finite gate voltage
- Doped graphene as tunable electron-phonon coupling material
- Mechanism for current saturation and energy dissipation in graphene transistors
- Electron-electron interactions in the conductivity of graphene
- Temperature dependence of the anharmonic decay of optical phonons in carbon nanotubes and graphite
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