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Coulomb blockade in two island systems with highly conductive junctions

B. Limbach·P. vom Stein·C. Wallisser·R. Schaefer
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Abstract

We report measurements on single-electron pumps, consisting of two metallic islands formed by three tunnel junctions in series. We focus on the linear-response conductance as a function of gate voltage and temperature of three samples with varying system parameters. In all cases, strong quantum fluctuation phenomena are observed by a log(k_B T/(2 E_co)) reduction of the maximal conductance, where E_co measures the coupling strength between the islands. The samples display a rich phenomenology, culminating in a non-monotonic behavior of the maximal conductance as a function of temperature.

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B. Limbach, P. vom Stein, C. Wallisser, R. Schaefer. 2004-01-21. Coulomb blockade in two island systems with highly conductive junctions. https://doi.org/10.1103/physrevb.72.045319

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