• 文献标题:   Sub-Poissonian shot noise in graphene
  • 文献类型:   Article
  • 作  者:   TWORZYDLO J, TRAUZETTEL B, TITOV M, RYCERZ A, BEENAKKER CWJ
  • 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 Warsaw
  • 被引频次:   610
  • DOI:   10.1103/PhysRevLett.96.246802
  • 出版年:   2006

▎ 摘  要

We calculate the mode-dependent transmission probability of massless Dirac fermions through an ideal strip of graphene (length L, width W, no impurities or defects) to obtain the conductance and shot noise as a function of Fermi energy. We find that the minimum conductivity of order e(2)/h at the Dirac point (when the electron and hole excitations are degenerate) is associated with a maximum of the Fano factor (the ratio of noise power and mean current). For short and wide graphene strips the Fano factor at the Dirac point equals 1/3, 3 times smaller than for a Poisson process. This is the same value as for a disordered metal, which is remarkable since the classical dynamics of the Dirac fermions is ballistic.