title: Quantum percolation in granular metals.
abstract: Theory of quantum corrections to conductivity of granular metal films is developed for the realistic case of large randomly distributed tunnel conductances. Quantum fluctuations of intergrain voltages (at energies E much below the bare charging energy scale E(C)) suppress the mean conductance g (E) much more strongly than its standard deviation sigma(E). At sufficiently low energies E(*) any distribution becomes broad, with sigma(E(*)) approximately g (E(*)), leading to strong local fluctuations of the tunneling density of states. The percolative nature of the metal-insulator transition is established by a combination of analytic and numerical analysis of the matrix renormalization group equations.
authors.affiliation: L.D. Landau Institute for Theoretical Physics, Moscow 119334, Russia.
authors.forename: M V
authors.initials: MV
authors.lastname: Feigel'man
authors.forename: A S
authors.initials: AS
authors.lastname: Ioselevich
authors.forename: M A
authors.initials: MA
authors.lastname: Skvortsov