• 文献标题:   Ultrafast carrier dynamics in Landau-quantized graphene
  • 文献类型:   Review
  • 作  者:   WENDLER F, KNORR A, MALIC E
  • 作者关键词:  
  • 出版物名称:   NANOPHOTONICS
  • ISSN:   2192-8606 EI 2192-8614
  • 通讯作者地址:   Chalmers Univ Technol
  • 被引频次:   19
  • DOI:   10.1515/nanoph-2015-0018
  • 出版年:   2015

▎ 摘  要

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.