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Low voltage conductance of small tunnel junctions

F. Guinea·M. Ueda
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Abstract

A discrete charge transfer in a small tunnel junction where Coulomb interactions are important can excite electron-hole pairs near the Fermi level. We use a simple model to study the associated nonequilibrium properties and found two novel effects: (i) for junctions with electrodes of the same electronic properties, a leakage current exists within the Coulomb gap even when the environmental impedance is infinite; (ii) for junctions with electrodes of different electronic properties, the differential conductance diverges when a net interaction between conduction electrons is attractive, and it is strongly suppressed for a net repulsive interaction.

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F. Guinea, M. Ueda. 1992-07-06. Low voltage conductance of small tunnel junctions. https://arxiv.org/abs/cond-mat/9207007

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