Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 11: Nanoelektronik I: Quantenpunkte, -dr
ähte, -punktkontakte

TT 11.2: Vortrag

Dienstag, 9. März 2004, 09:45–10:00, H19

The Coulomb blockade in two island systems with high conductive junctions — •Roland Schäfer, Bernhard Limbach, Peter vom Stein, and Christoph Wallisser — Forschungszentrum Karlsruhe, Institut für Festkörperphysik, Postfach 3640, 76021 Karlsruhe

We report measurements on single electron pumps consisting of two metallic islands formed by three tunnel junctions in a row. We focus on the linear response conductance as a function of gate voltages and temperature of three samples with varying system parameters. In all cases strong quantum fluctuation phenomena are observed by a log(k_BT/(2E_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.