• 文献标题:   Ground State of Graphene in the Presence of Random Charged Impurities
  • 文献类型:   Article
  • 作  者:   ROSSI E, DAS SARMA S
  • 作者关键词:  
  • 出版物名称:   PHYSICAL REVIEW LETTERS
  • ISSN:   0031-9007 EI 1079-7114
  • 通讯作者地址:   Univ Maryland
  • 被引频次:   119
  • DOI:   10.1103/PhysRevLett.101.166803
  • 出版年:   2008

▎ 摘  要

We calculate the carrier-density-dependent ground-state properties of graphene in the presence of random charged impurities in the substrate taking into account disorder and interaction effects nonperturbatively on an equal footing in a self-consistent theoretical formalism. We provide detailed quantitative results on the dependence of the disorder-induced spatially inhomogeneous two-dimensional carrier density distribution on the external gate bias, the impurity density, and the impurity location. We find that the interplay between disorder and interaction is strong, particularly at lower impurity densities. We show that, for the currently available typical graphene samples, inhomogeneity dominates graphene physics at low (less than or similar to 10(12) cm(-2)) carrier density with the density fluctuations becoming larger than the average density.