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HL: Halbleiterphysik

HL 40: Preistr
ägervortrag Belzig

HL 40.1: Talk

Monday, March 7, 2005, 12:30–13:15, TU P270

Quantum noise in mesoscopic systems — •Wolfgang Belzig — Department of Physics and Astronomy, University of Basel, Klingelbergstr. 82, 4056 Basel, Switzerland — Träger des Walter-Schottky-Preises

Full counting statistics aims at a complete characterization of the distribution of measurement outcomes. In my talk I will demonstrate how this concept allows to investigate quantum correlations in a variety of mesoscopic systems. Three examples will be discussed:
a) In analogy to Schottky’s work on the current fluctuations in a vacuum diode, shot noise in superconducting contacts allows to identify the nature of the elementary charge transfer events.
b) The Coulomb interaction in complex quantum dots or molecules leads to a strongly correlated current statistics.
c) The density fluctuation statistics in a fermionic quantum gas reflects the crossover from a superfluid state to a molecular Bose-Einstein condensate.