• Corpus ID: 118826444

Evolution of photo-excited carrier distribution from anisotropic to isotropic and isotropic photon absorption in graphene

@article{Yan2013EvolutionOP,
  title={Evolution of photo-excited carrier distribution from anisotropic to isotropic and isotropic photon absorption in graphene},
  author={Xiaoqing Yan and Zhi-bo Liu and Jun Yao and Xin Zhao and Xu-Dong Chen and Yongsheng Chen and Jian Guo Tian},
  journal={arXiv: Mesoscale and Nanoscale Physics},
  year={2013}
}

• Xiaoqing Yan, Zhi-bo Liu, +4 authors J. Tian
• Published 23 December 2013
• Physics
• arXiv: Mesoscale and Nanoscale Physics

Femtosecond time-resolved spectroscopy using 400 nm-pump and 800 nm-probe in CVD-grown multilayer graphene provides strong evidence for isotropic distribution of photoexcited carrier after initial relaxation. Indicative of such isotropic distribution is a pump polarization independence of differential reflectivity (\DeltaR/R) and transmittance (\DeltaT/T) from pump-probe measurements. Combined with results using 800 nm-pump in [arXiv. 1301.1743v3 (2013)], these pump polarization dependences of time-resolved spectroscopy corroborates the evolution of photo-excited carrier distribution from anisotropic to isotropic with carrier relaxation. And, the absorbance of graphene is identical for in-plane and out-of-plane optical fields. No matter the carrier distribution in momentum space, the influence of carrier on in-plane and out-of-plane optical fields from state filling effect is identical. The sign reversing of ps dynamics signal in graphene/graphite should not directly relate to carrier.