Münster 1999 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 4: Eigenschaften mesoskopischer Systeme
TT 4.8: Vortrag
Montag, 22. März 1999, 18:00–18:15, F1
Signatures of Classical Chaos in Weak Localization in Antidot Arrays: Experiment and Theory — •O. Yevtushenko1,2, G. Lütjering2, D. Weiss2, and K. Richter1 — 1Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, 01187 Dresden, Germany — 2Institut für theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany.
We study theoretically and experimentally quantum (weak localization) corrections to the classical magneto-conductivity of a two-dimensional ballistic system with antidots placed both on a regular lattice and randomly. We compare experimental results for the flux- and temperature-dependence of the weak localization correction with different theoretical models. The experimental resistivity curves, which strongly deviate from those for diffusive systems, show a clear manifestation of the chaotic motion and correlations in the classical dynamics of electrons in the antidot landscape. The results support the significance of the Ehrenfest time as a relevant timescale for ballistic weak localization.