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Sökning: WFRF:(Brem S) > (2017)

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  • Wendler, Florian, 1982, et al. (författare)
  • Symmetry-Breaking Supercollisions in Landau-Quantized Graphene
  • 2017
  • Ingår i: Physical Review Letters. - 1079-7114 .- 0031-9007. ; 119:6, s. Article no 067405 -
  • Tidskriftsartikel (refereegranskat)abstract
    • Recent pump-probe experiments performed on graphene in a perpendicular magnetic field have revealed carrier relaxation times ranging from picoseconds to nanoseconds depending on the quality of the sample. To explain this surprising behavior, we propose a novel symmetry-breaking defect-assisted relaxation channel. This enables scattering of electrons with single out-of-plane phonons, which drastically accelerate the carrier scattering time in low-quality samples. The gained insights provide a strategy for tuning the carrier relaxation time in graphene and related materials by orders of magnitude.
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  • Malic, Ermin, 1980, et al. (författare)
  • Carrier Dynamics in Graphene: Ultrafast Many-Particle Phenomena
  • 2017
  • Ingår i: Annalen der Physik. - : Wiley. - 0003-3804 .- 1521-3889. ; 529:11
  • Tidskriftsartikel (refereegranskat)abstract
    • Graphene is an ideal material to study fundamental Coulomb- and phonon-induced carrier scattering processes. Its remarkable gapless and linear band structure opens up new carrier relaxation channels. In particular, Auger scattering bridging the valence and the conduction band changes the number of charge carriers and gives rise to a significant carrier multiplication - an ultrafast many-particle phenomenon that is promising for the design of highly efficient photodetectors. Furthermore, the vanishing density of states at the Dirac point combined with ultrafast phonon-induced intraband scattering results in an accumulation of carriers and a population inversion suggesting the design of graphene-based terahertz lasers. Here, we review our work on the ultrafast carrier dynamics in graphene and Landau-quantized graphene is presented providing a microscopic view on the appearance of carrier multiplication and population inversion.
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