Quantum percolation in granular metals
arXiv:cond-mat/0404350 · doi:10.1103/PhysRevLett.93.136403
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 bare charging energy scale E_C) suppress the mean conductance \bar{g}(E) much stronger than its standard deviation σ(E). At sufficiently low energies E_* any distribution becomes broad, with σ(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.
6 pages, 5 figures, REVTeX 4
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Cited by in corpus (9)
- Granular Electronic Systems
- Coulomb effects and hopping transport in granular metals
- Variable range cotunneling and conductivity of a granular metal
- Percolation model for the superconductor-insulator transition in granular films
- Localization in random fractal lattices
- Unusual localisation effects in quantum percolation
- Hall Transport in Granular Metals and Effects of Coulomb Interactions
- Localization-delocalization transitions in a two-dimensional quantum percolation model: von Neumann entropy studies
- Diffusion and localization in quantum random resistor networks