Current injection by coherent one- and two-photon excitation in graphene and its bilayer

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2011
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Physical Review B ; 83 (2011), 19. - ISSN 1098-0121
Abstract
Coherent control of optically injected carrier distributions in single and bilayer graphene allows the injection of electrical currents. Using a tight-binding model and Fermi’s golden rule, we derive the carrier and photocurrent densities achieved via interference of the quantum amplitudes for two-photon absorption at a fundamental frequency, ω, and one-photon absorption at the second harmonic, 2ω. Strong currents are injected under co-circular and linear polarizations. In contrast, opposite-circular polarization yields no net current. For single-layer graphene, the magnitude of the current is unaffected by the rotation of linear-polarization axes, in contrast with the bilayer and with conventional semiconductors. The dependence of the photocurrent on the linear-polarization axes is a clear and measurable signature of interlayer coupling in AB-stacked multilayer graphene. We also find that single and bilayer graphene exhibit a strong, distinct linear-circular dichroism in two-photon absorption.
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ISO 690RIOUX, Julien, Guido BURKARD, John SIPE, 2011. Current injection by coherent one- and two-photon excitation in graphene and its bilayer. In: Physical Review B. 83(19). ISSN 1098-0121. Available under: doi: 10.1103/PhysRevB.83.195406
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@article{Rioux2011Curre-19161,
  year={2011},
  doi={10.1103/PhysRevB.83.195406},
  title={Current injection by coherent one- and two-photon excitation in graphene and its bilayer},
  number={19},
  volume={83},
  issn={1098-0121},
  journal={Physical Review B},
  author={Rioux, Julien and Burkard, Guido and Sipe, John}
}
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