title: Sub-Poissonian shot noise in graphene.
abstract: 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 e2/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.
authors.affiliation: Institute of Theoretical Physics, Warsaw University, Hoza 69, 00-681 Warsaw, Poland.
authors.forename: J
authors.initials: J
authors.lastname: Tworzydło
authors.forename: B
authors.initials: B
authors.lastname: Trauzettel
authors.forename: M
authors.initials: M
authors.lastname: Titov
authors.forename: A
authors.initials: A
authors.lastname: Rycerz
authors.forename: C W J
authors.initials: CW
authors.lastname: Beenakker