Coulomb blockade in two island systems with highly conductive junctions
B. Limbach, P. vom Stein, C. Wallisser, R. Schaefer (Forschungszenrtum, Karlsruhe, Institut fuer Festkoerperphysik, Germany)
TL;DR
This paper investigates Coulomb blockade effects in two-metallic-island systems with highly conductive junctions, revealing quantum fluctuations and non-monotonic conductance behavior influenced by temperature and coupling strength.
Contribution
It provides experimental insights into quantum fluctuations and conductance phenomena in two-island systems with highly conductive junctions, highlighting non-monotonic temperature dependence.
Findings
Quantum fluctuations reduce maximal conductance logarithmically with temperature.
Non-monotonic conductance behavior observed as temperature varies.
Strong coupling between islands influences conductance characteristics.
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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