Transmission Phase in the Kondo Regime Revealed in a Two-Path Interferometer

S. Takada, C. Bäuerle, M. Yamamoto, K. Watanabe, S. Hermelin, T. Meunier, A. Alex, A. Weichselbaum, J. von Delft, A. Ludwig, A. D. Wieck, and S. Tarucha
Phys. Rev. Lett. 113, 126601 – Published 15 September 2014
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Abstract

We report on the direct observation of the transmission phase shift through a Kondo correlated quantum dot by employing a new type of two-path interferometer. We observed a clear π/2-phase shift, which persists up to the Kondo temperature TK. Above this temperature, the phase shifts by more than π/2 at each Coulomb peak, approaching the behavior observed for the standard Coulomb blockade regime. These observations are in remarkable agreement with two-level numerical renormalization group calculations. The unique combination of experimental and theoretical results presented here fully elucidates the phase evolution in the Kondo regime.

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  • Received 21 November 2013

DOI:https://doi.org/10.1103/PhysRevLett.113.126601

© 2014 American Physical Society

Authors & Affiliations

S. Takada1,*, C. Bäuerle2,3, M. Yamamoto1,4, K. Watanabe1, S. Hermelin2,3, T. Meunier2,3, A. Alex5, A. Weichselbaum5, J. von Delft5, A. Ludwig6, A. D. Wieck6, and S. Tarucha1,7,†

  • 1Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
  • 2Université Grenoble Alpes, Institut NEEL, F-38042 Grenoble, France
  • 3CNRS, Institut NEEL, F-38042 Grenoble, France
  • 4PRESTO, JST, Kawaguchi-shi, Saitama 331-0012, Japan
  • 5Physics Department, Arnold Sommerfeld Center for Theoretical Physics, and Center for NanoScience, Ludwig-Maximilians-Universität, Theresienstraße 37, 80333 München, Germany
  • 6Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, Universitätsstraße 150, 44780 Bochum, Germany
  • 7RIKEN Center for Emergent Matter Science (CEMS), 2-1 Hirosawa, Wako-shi, Saitama 31-0198, Japan

  • *Present address: CNRS, Institut NEEL, F-38042 Grenoble, France.
  • tarucha@ap.t.u-tokyo.ac.jp

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Vol. 113, Iss. 12 — 19 September 2014

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