Regensburg 2007 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 20: Correlated Electrons - Poster Session

TT 20.27: Poster

Mittwoch, 28. März 2007, 14:00–17:45, Poster A

Causes of weak-localization of electrons on liquid helium — •Jürgen Klier, Annie Wakata, and Paul Leiderer — Universität Konstanz, Fachbereich Physik, D-78457 Konstanz

Weak localization (WL) is a quantum effect caused by the coherence among multiple elastic-scattering paths of a conduction electron. This coherence leads to an enhanced backscattering probability and an increase in the resistivity over the classical Drude model. We have investigated the dephasing processes in a weak localization experiment of a two-dimensional electron system on liquid helium. From low-field magnetoconductivity measurements we can separate the damping of WL on the dephasing of electrons due to electron-electron interaction and the motion of the helium vapour atoms. We observe an intermediate regime where both damping mechanisms are of comparable importance and determine the transition from one dominant regime to the other. This is the first observation of a cross-over from the simple exponential decay to the cubic exponential damping in such a system.