Quantum percolation in granular metals

Details Quantum percolation in granular metals Quantum percolation in granular metals

2004-04-15

arxiv.org/abs/cond-mat/0404350v1

Phys. Rev. Lett. 93, 136403 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 5 figures, REVTeX 4

Scientific paper

10.1103/PhysRevLett.93.136403

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 bare charging energy scale E_C) suppress the mean conductance \bar{g}(E) much stronger than its standard deviation \sigma(E). At sufficiently low energies E_* any distribution becomes broad, with \sigma(E_*) ~ \bar{g}(E_*), leading to strong local fluctuations of the tunneling density of states. Percolative nature of metal-insulator transition is established by combination of analytic and numerical analysis of the matrix renormalization group equations.

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