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TT: Fachverband Tiefe Temperaturen

TT 1: Tutorial: Quantum Shot Noise

TT 1.2: Tutorium

Sonntag, 24. Februar 2008, 15:00–16:00, EW 201

Shot noise and electron counting measurements in low dimensional electron systems — •Frank Hohls — Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstr. 2, D-30167 Hannover

The noise is the signal! In this presentation I will first give an experimentalists introduction on what we can learn and have learned about low dimensional electron systems by measurements of the current shot noise. Noise can be used as a tool to examine fundamental aspects of a system or to characterize its parameters. In the second part I will show how even more information can be gained in quantum dot systems: we can now eavesdrop on the individual tunnelling events of electrons into and out of such small island with quantized charge. With a time resolved recording of these individual events which compose the current we can set out to characterize the detailed dynamics of the system and compile full counting statistics. I will discuss recent progress and future possibilities of this method.