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- W1896349058 abstract "Abstract In an external magnetic field, the energy of massless charge carriers in graphene is quantized into non-equidistant degenerate Landau levels including a zero-energy level. This extraordinary electronic dispersion gives rise to a fundamentally new dynamics of optically excited carriers. Here, we review the state of the art of the relaxation dynamics in Landau-quantized graphene focusing on microscopic insights into possible many-particle relaxation channels.We investigate optical excitation into a non equilibrium distribution followed by ultrafast carrier- carrier and carrier-phonon scattering processes. We reveal that surprisingly the Auger scattering dominates the relaxation dynamics in spite of the non-equidistant Landau quantization in graphene. Furthermore, we demonstrate how technologically relevant carrier multiplication can be achieved and discuss the possibility of optical gain in Landau-quantized graphene. The provided microscopic view on elementary many-particle processes can guide future experimental studies aiming at the design of novel graphene-based optoelectronic devices, such as highly efficient photodetectors, solar cells, and spectrally broad Landau level lasers." @default.
- W1896349058 created "2016-06-24" @default.
- W1896349058 creator A5057703808 @default.
- W1896349058 creator A5076852747 @default.
- W1896349058 creator A5087936086 @default.
- W1896349058 date "2015-01-01" @default.
- W1896349058 modified "2023-10-12" @default.
- W1896349058 title "Ultrafast carrier dynamics in Landau-quantized graphene" @default.
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