Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 11: Quantum Impurities, Kondo Physics
TT 11.5: Vortrag
Dienstag, 27. März 2007, 10:30–10:45, H19
Transmission through a two-level quantum dot — •Theresa Hecht1, Christoph Karrasch2, Andreas Weichselbaum1, Yuval Oreg3, Jan von Delft1, and Volker Meden2 — 1Department für Physik, CeNS und Arnold Sommerfeld Center, Ludwig-Maximilians Universität München — 2Institut für Theoretische Physik, Universität Göttingen — 3Department of Condensed Matter Physics, The Weizmann Institute of Science, Israel
Measurements of the transmission phase shift of many-electron quantum dots revealed a “universal“ phase behavior with phase lapses of π between consecutive resonances, whereas for dots with only a few electrons the phase behaves “mesoscopically“ [1]. These generic features were reproduced in [2] for a spinless many-level Anderson model (AM) in the limits of δ/Γ≪1 (universal) and δ/Γ≫1 (mesoscopic), where δ is the mean level spacing, Γ the mean level width. Inspired by the experiment and based on [2], we now extend the studies to a many-level spinfull AM by means of Wilson’s numerical renormalization group method and investigate the temperature dependence of the transmission through the quantum dot.
[1] M. Avinun-Kalish, M. Heiblum, O. Zarchin, D. Mahalu, V. Umansky, Nature 436, 529 (2005)
[2] C. Karrasch, T. Hecht, Y. Oreg, J. von Delft, and V. Meden (2006), cond-mat/0609191