Mesoscopic to Universal Crossover of the Transmission Phase of Multilevel Quantum Dots

C. Karrasch, T. Hecht, A. Weichselbaum, Y. Oreg, J. von Delft, and V. Meden
Phys. Rev. Lett. 98, 186802 – Published 1 May 2007

Abstract

Transmission phase α measurements of many-electron quantum dots (small mean level spacing δ) revealed universal phase lapses by π between consecutive resonances. In contrast, for dots with only a few electrons (large δ), the appearance or not of a phase lapse depends on the dot parameters. We show that a model of a multilevel quantum dot with local Coulomb interactions and arbitrary level-lead couplings reproduces the generic features of the observed behavior. The universal behavior of α for small δ follows from Fano-type antiresonances of the renormalized single-particle levels.

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  • Received 8 September 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.186802

©2007 American Physical Society

Authors & Affiliations

C. Karrasch1, T. Hecht2, A. Weichselbaum2, Y. Oreg3, J. von Delft2, and V. Meden1

  • 1Institut für Theoretische Physik, Universität Göttingen, 37077 Göttingen, Germany
  • 2Physics Department, Arnold Sommerfeld Center for Theoretical Physics, and Center for NanoScience, Ludwig-Maximilians-Universität, 80333 Munich, Germany
  • 3Department of Condensed Matter Physics, The Weizmann Institute of Science, Rehovot 76100, Israel

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Vol. 98, Iss. 18 — 4 May 2007

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