Abstract

In the vicinity of the Coulomb blockade threshold virtual electron tunneling leads to effective screening of the charge on small metallic junctions. We present a nonperturbative calculation of the junction ground state energy and level splitting close to the edges of the Brillouin zone. We show that the electron tunneling rate can be substantially suppressed due to quantum fluctuations of the charge and the junction current-voltage characteristic becomes nonlinear near the Coulomb gap. We also investigate linear transport properties of a single tunnel junction in the presence of Coulomb effects.

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