Regensburg 2010 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 19: Quantum Chaos
DY 19.10: Vortrag
Mittwoch, 24. März 2010, 16:45–17:00, H38
Increase of conductance fluctuations with Ehrenfest time in presence of tunnel barriers — •Daniel Waltner1, Jack Kuipers1, Cyril Petitjean1, Philippe Jacquod2, and Klaus Richter1 — 1Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany — 2Physics Department, University of Arizona, Tucson, AZ 85721, USA
We study the effect of tunnel barriers on the Ehrenfest-time dependence of universal conductance fluctuations (UCF) for classically chaotic systems. In the case of strong coupling to the leads UCF are independent of the Ehrenfest time: this was observed numerically in [1] and then explained analytically in [2]. In the case of very opaque tunnel barriers, that we consider here, an increase of UCF with increasing Ehrenfest time is observed in numerical simulations that we address analytically in this talk.
[1]J. Tworzydło et al., Phys. Rev. B 69, 165318 (2004); P. Jacquod
and E. V. Sukhorukov, Phys. Rev. Lett. 92, 116801 (2004).
[2]P. W. Brouwer and S. Rahav, Phys. Rev. B 74, 075322 (2006).