• 文献标题:   Relaxation of optically excited carriers in graphene
  • 文献类型:   Article
  • 作  者:   KIM R, PEREBEINOS V, AVOURIS P
  • 作者关键词:  
  • 出版物名称:   PHYSICAL REVIEW B
  • ISSN:   1098-0121 EI 1550-235X
  • 通讯作者地址:   Purdue Univ
  • 被引频次:   95
  • DOI:   10.1103/PhysRevB.84.075449
  • 出版年:   2011

▎ 摘  要

We explore the relaxation of photoexcited graphene by solving a transient Boltzmann transport equation with electron-phonon (e-ph) and electron-electron (e-e) scattering. Simulations show that when the excited carriers are relaxed by e-ph scattering only, a population inversion can be achieved at energies determined by the photon energy. However, e-e scattering quickly thermalizes the carrier energy distributions washing out the negative optical conductivity peaks. The relaxation rates and carrier multiplication effects are presented as a function of photon energy, graphene doping, and dielectric constant.