Abstract
We discuss the suppression of Coulomb effects in the low temperature conductanceg(T) of small tunnel junctions with increasing dissipation or bare conductanceg. The conductance is expressed in terms of the spin correlation fuction of a classical one dimensionalXY-model with ferromagnetic nearest neighbor plus inverse square interaction. It is shown that at low temperatures the conductance vanishes asymptotically likeT 2 instead of exponentially. A Coulomb gap in the sense of a thermally activated contribution tog(T) is present only for bare conductances smaller thang c ∼1. A simple model for the spin correlation functions is compared with experiments.
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Zwerger, W., Scharpf, M. Crossover from Coulomb-blockade to ohmic conduction in small tunnel junctions. Z. Physik B - Condensed Matter 85, 421–426 (1991). https://doi.org/10.1007/BF01307639
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DOI: https://doi.org/10.1007/BF01307639