• 文献标题:   Diffusion of photoexcited carriers in graphene
  • 文献类型:   Article
  • 作  者:   VASKO FT, MITIN VV
  • 作者关键词:  
  • 出版物名称:   APPLIED PHYSICS LETTERS
  • ISSN:   0003-6951 EI 1077-3118
  • 通讯作者地址:   SUNY Buffalo
  • 被引频次:   2
  • DOI:   10.1063/1.4759034
  • 出版年:   2012

▎ 摘  要

The diffusion of electron-hole pairs, which are excited in an intrinsic graphene by the ultrashort focused laser pulse in mid-IR or visible spectral region, is described for the cases of peak-like or spread over the passive region distributions of carriers. The spatio-temporal transient optical response on a high-frequency probe beam appears to be strongly dependent on the regime of diffusion and can be used for verification of the elasic relaxation mechanism. Sign flip of the differential transmission coefficient takes place due to interplay of the carrier-induced contribution and weak dynamic conductivity of undoped graphene. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4759034]